Species Recorded | Taxon | Scientific Name | Common Name | Records | Latest |
| algae or stonewort | Bostrychia scorpioides | an alga | 2 | 2016 |
| amphibian | Bufo bufo | Common Toad | 2422 | 2020 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Banchus volutatorius | an ichneumon wasp | 2 | 2016 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Basalys crassiceps | a small parasitic wasp | 1 | 1997 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Belyta forticornis | a small parasitic wasp | 2 | 2003 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Belyta rugosicollis | a small parasitic wasp | 2 | 2009 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Biorhiza pallida | Oak Apple | 41 | 2019 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Biorhiza pallida f. sexual | an insect - hymenopteran | 43 | 2002 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Blacus ruficornis | a braconid wasp | 1 | 2003 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Blennocampa phyllocolpa | a sawfly | 1 | 2012 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus | a bumble bee (unidentified) | 311 | 2021 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus (Bombus) lucorum | White-tailed Bumble Bee | 405 | 2020 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus (Bombus) terrestris | Buff-tailed Bumble Bee | 774 | 2021 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus lucorum/terrestris | White/Buff-Tailed Bumblebee Workers | 6 | 2020 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus (Megabombus) hortorum | Small Garden Bumble Bee | 283 | 2020 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus (Megabombus) ruderatus | Large Garden Bumble Bee | 1 | 2010 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus (Melanobombus) lapidarius | Red-tailed Bumblebee | 846 | 2020 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus (Psithyrus) | a cuckoo bee (unidentified) | 3 | 2012 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus (Psithyrus) barbutellus | Barbut's Cuckoo Bee | 8 | 2013 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus (Psithyrus) bohemicus | Gipsy Cuckoo Bee | 4 | 1999 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus (Psithyrus) campestris | Field Cuckoo Bee | 44 | 2013 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus (Psithyrus) rupestris | Hill Cuckoo Bee | 28 | 2011 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus (Psithyrus) sylvestris | Forest Cuckoo Bumble Bee | 31 | 2015 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus (Psithyrus) vestalis | Vestal Cuckoo Bee | 141 | 2019 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus (Pyrobombus) hypnorum | Tree Bumblebee | 207 | 2021 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus (Pyrobombus) pratorum | Early Bumble Bee | 440 | 2020 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus (Subterraneobombus) subterraneus | Short Haired Bumble Bee | 1 | 1995 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus (Thoracobombus) humilis | Brown-banded Carder Bee | 3 | 2016 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus (Thoracobombus) muscorum | Moss Carder-bee | 4 | 2019 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus (Thoracobombus) pascuorum | Common Carder Bee | 1180 | 2020 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus (Thoracobombus) ruderarius | Red-tailed Carder Bee | 27 | 2014 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus (Thoracobombus) sylvarum | Shrill Carder Bee | 4 | 2011 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bracon erraticus | a braconid wasp | 1 | 1997 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Braconidae | a Braconidae species (unidentified) | 1 | 2013 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bracon minutator | a braconid wasp | 2 | 1995 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bracon terebella | a braconid wasp | 1 | 2008 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bracon variator | a braconid wasp | 3 | 2009 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Buathra laborator | an insect - hymenopteran | 4 | 2018 |
| beetle | Badister | a Badister species (unidentified) | 1 | 2014 |
| beetle | Badister (Badister) bullatus | a ground beetle | 35 | 2019 |
| beetle | Badister (Badister) unipustulatus | a ground beetle | 4 | 2018 |
| beetle | Bagous (Bagous) limosus | a weevil | 4 | 2011 |
| beetle | Bagous (Bagous) tempestivus | a weevil | 4 | 1983 |
| beetle | Bagous (Hydronomus) alismatis | a weevil | 8 | 2000 |
| beetle | Barynotus obscurus | Ground Weevil | 5 | 2017 |
| beetle | Barypeithes (Exomias) araneiformis | Spider weevil | 3 | 1995 |
| beetle | Barypeithes (Exomias) pellucidus | Hairy spider weevil | 18 | 2019 |
| beetle | Batophila aerata | a Raspberry Flea Beetle | 6 | 2018 |
| beetle | Batophila rubi | a Raspberry Flea Beetle | 1 | 2003 |
| beetle | Bembidion (Bembidion) quadrimaculatum | a ground beetle | 20 | 2018 |
| beetle | Bembidion (Diplocampa) assimile | a ground beetle | 5 | 2004 |
| beetle | Bembidion (Emphanes) minimum | a ground beetle | 9 | 2018 |
| beetle | Bembidion (Emphanes) normannum | a ground beetle | 1 | 2017 |
| beetle | Bembidion (Eupetedromus) dentellum | a ground beetle | 2 | 2017 |
| beetle | Bembidion (Metallina) lampros | a ground beetle | 87 | 2018 |
| beetle | Bembidion (Metallina) properans | a ground beetle | 13 | 2018 |
| beetle | Bembidion (Nepha) illigeri | a ground beetle | 2 | 2018 |
| beetle | Bembidion (Notaphus) varium | a ground beetle | 3 | 2015 |
| beetle | Bembidion (Ocydromus) maritimum | a ground beetle | 3 | 2018 |
| beetle | Bembidion (Ocydromus) tetracolum | an insect - beetle (Coleoptera) | 35 | 2016 |
| beetle | Bembidion (Philochthus) aeneum | a ground beetle | 27 | 2016 |
| beetle | Bembidion (Philochthus) biguttatum | a ground beetle | 12 | 2018 |
| beetle | Bembidion (Philochthus) guttula | a ground beetle | 62 | 2018 |
| beetle | Bembidion (Philochthus) iricolor | a ground beetle | 22 | 2018 |
| beetle | Bembidion (Philochthus) lunulatum | a ground beetle | 44 | 2018 |
| beetle | Bembidion (Philochthus) mannerheimii | a ground beetle | 4 | 2018 |
| beetle | Bembidion (Phyla) obtusum | a ground beetle | 74 | 2018 |
| beetle | Bembidion (Testedium) bipunctatum | a ground beetle | 1 | 1985 |
| beetle | Bembidion (Trepanedoris) doris | a ground beetle | 2 | 2015 |
| beetle | Berosus (Berosus) affinis | a scavenger water beetle | 106 | 2018 |
| beetle | Berosus (Berosus) signaticollis | a scavenger water beetle | 2 | 2009 |
| beetle | Bibloplectus ambiguus | a short-winged mould beetle | 1 | 1983 |
| beetle | Bibloporus bicolor | a short-winged mould beetle | 2 | 2016 |
| beetle | Biphyllus lunatus | a biphyllid beetle | 5 | 2019 |
| beetle | Bisnius fimetarius | a rove beetle | 6 | 2017 |
| beetle | Bisnius sordidus | a rove beetle | 2 | 2008 |
| beetle | Bitoma crenata | a narrow timber beetle | 1 | 2001 |
| beetle | Blaps lethifera | a darkling beetle | 1 | 1920 |
| beetle | Blaps mucronata | Cellar Beetle | 9 | 2013 |
| beetle | Bledius (Hesperophilus) gallicus | a rove beetle | 2 | 1986 |
| beetle | Bolitobius castaneus | an insect - beetle (Coleoptera) | 1 | 1986 |
| beetle | Bolitobius cingulatus | a rove beetle | 1 | 2015 |
| beetle | Bolitochara obliqua | a rove beetle | 1 | 2001 |
| beetle | Brachinus (Brachinus) crepitans | Bombardier Beetle | 2 | 1953 |
| beetle | Brachygluta helferi | a short-winged mould beetle | 4 | 2018 |
| beetle | Brachypterus glaber | a pollen or sap beetle | 9 | 2018 |
| beetle | Brachypterus urticae | Nettle Pollen Beetle | 21 | 2018 |
| beetle | Bradycellus harpalinus | a ground beetle | 3 | 2013 |
| beetle | Bradycellus verbasci | a ground beetle | 34 | 2019 |
| beetle | Broscus cephalotes | a ground beetle | 1 | 1995 |
| beetle | Bruchidius | a Bruchidius species (unidentified) | 1 | 2012 |
| beetle | Bruchidius cisti | a seed beetle | 1 | 2001 |
| beetle | Bruchidius varius | a seed beetle | 2 | 2017 |
| beetle | Bruchidius villosus | a seed beetle | 1 | 2017 |
| beetle | Bruchus atomarius | a seed beetle | 3 | 2017 |
| beetle | Bruchus loti | a seed beetle | 7 | 2018 |
| beetle | Bruchus pisorum | Pea Beetle | 2 | 1999 |
| beetle | Bruchus rufimanus | Bean Beetle | 8 | 2019 |
| beetle | Bruchus rufipes | a seed beetle | 4 | 2019 |
| beetle | Bryaxis bulbifer | a short-winged mould beetle | 2 | 2016 |
| beetle | Bryaxis curtisii | an insect - beetle (Coleoptera) | 2 | 2007 |
| beetle | Brychius elevatus | a crawling water beetle | 1 | 2000 |
| beetle | Byrrhus pilula | Pill Beetle | 11 | 2017 |
| beetle | Byturus | a Byturus species (unidentified) | 1 | 2018 |
| beetle | Byturus ochraceus | a raspberry beetle | 18 | 2019 |
| beetle | Byturus tomentosus | Raspberry Beetle | 44 | 2019 |
| bird | Bartramia longicauda | Upland Sandpiper | 3 | 2005 |
| bird | Bombycilla garrulus | Waxwing | 255 | 2019 |
| bird | Botaurus stellaris | Bittern | 424 | 2019 |
| bird | Branta | a Branta goose (unidentified) | 23 | 2019 |
| bird | Branta bernicla | Brent Goose | 219 | 2020 |
| bird | Branta bernicla subsp. bernicla | Dark-bellied Brent Goose | 53 | 2019 |
| bird | Branta bernicla subsp. hrota | Pale-bellied Brent Goose | 27 | 2012 |
| bird | Branta bernicla x Branta leucopsis | Brent Goose x Barnacle Goose | 2 | 2018 |
| bird | Branta canadensis | Canada Goose | 6147 | 2021 |
| bird | Branta leucopsis | Barnacle Goose | 630 | 2019 |
| bird | Branta ruficollis | Red-breasted Goose | 14 | 2003 |
| bird | Bubo bubo | Eagle Owl | 4 | 2009 |
| bird | Bubulcus ibis | Cattle Egret | 438 | 2019 |
| bird | Bucephala albeola | Bufflehead | 11 | 2018 |
| bird | Bucephala clangula | Goldeneye | 1554 | 2019 |
| bird | Burhinus oedicnemus | Stone-curlew | 8 | 2018 |
| bird | Buteo | a buzzard (unidentified) | 55 | 2006 |
| bird | Buteo buteo | Buzzard | 12379 | 2021 |
| bird | Buteo lagopus | Rough-legged Buzzard | 1 | 1968 |
| bryozoan | Bowerbankia imbricata | a bryozoan | 4 | 1976 |
| bug | Balclutha punctata | a leafhopper | 1 | 1998 |
| bug | Berytinus | a Berytinus species (unidentified) | 1 | 2006 |
| bug | Berytinus (Berytinus) minor | a stiltbug | 2 | 2015 |
| bug | Blepharidopterus angulatus | Black-kneed Apple Capsid | 5 | 2018 |
| bug | Brachyarthrum limitatum | a plantbug or grassbug | 2 | 1999 |
| bug | Brachycaudus (Acaudus) cardui | Thistle Aphid | 1 | 2003 |
| bug | Brachycaudus (Acaudus) klugkisti | an aphid | 1 | 2015 |
| bug | Brachycaudus helichrysi | Leaf-curling Plum Aphid | 29 | 1975 |
| bug | Brevicoryne brassicae | Cabbage Aphid | 14 | 1975 |
| bug | Bryocoris pteridis | a plantbug or grassbug | 7 | 2015 |
| cockroach | Blatta orientalis | Common Cockroach | 2 | 1986 |
| cockroach | Blattella germanica | German Cockroach | 2 | 2015 |
| crustacean | Bathyporeia pilosa | a crustacean | 1 | 1976 |
| crustacean | Branchiopoda | a Branchiopoda species (unidentified) | 1 | 1993 |
| diatom | Bacillariophyceae | a Bacillariophyta diatom (unidentified) | 1 | 1998 |
| dragonfly, hawker or damselfly | Brachytron pratense | Hairy Dragonfly | 251 | 2020 |
| fish | Balistes capriscus | Grey Trigger Fish | 1 | 1879 |
| fish | Barbatula barbatula | Stone Loach | 106 | 2013 |
| fish | Barbus barbus | Barbel | 1 | 1996 |
| fish | Belone belone | Garfish | 2 | 1879 |
| fish | Blicca bjoerkna | Silver Bream | 1 | 1995 |
| fungus | Bactridium flavum | a fungus | 4 | 2012 |
| fungus | Baeospora myosura | a basidiomycete fungus | 17 | 2013 |
| fungus | Balsamia platyspora | a fungus | 1 | 1959 |
| fungus | Bartheletia paradoxa | a fungus | 1 | 2018 |
| fungus | Basidioradulum radula | a basidiomycete fungus | 12 | 2007 |
| fungus | Battarrea phalloides | Sandy Stilt Puffball | 2 | 2006 |
| fungus | Belonidium mollissimum | an ascomycete fungus | 3 | 1999 |
| fungus | Belonidium sulphureum | an ascomycete fungus | 2 | 2008 |
| fungus | Bertia moriformis var. moriformis | an ascomycete fungus | 5 | 2008 |
| fungus | Bionectria ralfsii | an ascomycete fungus | 3 | 2014 |
| fungus | Biscogniauxia nummularia | Beech Tarcrust | 25 | 2013 |
| fungus | Bisporella citrina | an ascomycete fungus | 64 | 2013 |
| fungus | Bisporella sulfurina | an ascomycete fungus | 11 | 2010 |
| fungus | Bjerkandera | a Bjerkandera species (unidentified) | 2 | 2012 |
| fungus | Bjerkandera adusta | Smokey Bracket | 162 | 2018 |
| fungus | Bjerkandera fumosa | a basidiomycete fungus | 8 | 2009 |
| fungus | Boeremia exigua var. viburni | a fungus | 1 | 1998 |
| fungus | Boeremia hedericola | a root rot fungus | 40 | 2014 |
| fungus | Bolbitius lacteus | a fungus | 1 | 1997 |
| fungus | Bolbitius reticulatus | an agaric | 5 | 2010 |
| fungus | Bolbitius titubans | Yellow Fieldcap | 52 | 2021 |
| fungus | Bolbitius titubans var. titubans | an agaric | 94 | 2020 |
| fungus | Boletales | a Boletales species (unidentified) | 1 | 2010 |
| fungus | Boletus badius | Bay Bolete | 17 | 2013 |
| fungus | Boletus bubalinus | Ascot Hat | 3 | 2014 |
| fungus | Boletus chrysenteron | Red-cracking Bolete | 92 | 2018 |
| fungus | Boletus cisalpinus | a fungus | 6 | 2013 |
| fungus | Boletus declivitatum | a fungus | 8 | 2010 |
| fungus | Boletus edulis | Cep | 12 | 2013 |
| fungus | Boletus erythropus | a fungus | 1 | 2017 |
| fungus | Boletus ferrugineus | a bolete | 1 | 1996 |
| fungus | Boletus luridiformis | a bolete | 1 | 2013 |
| fungus | Boletus luridiformis var. luridiformis | Scarletina Bolete | 11 | 2010 |
| fungus | Boletus luridus | a bolete | 105 | 2018 |
| fungus | Boletus luridus var. luridus | a fungus | 57 | 2010 |
| fungus | Boletus parasiticus | a bolete | 1 | 1990 |
| fungus | Boletus porosporus | a bolete | 11 | 2012 |
| fungus | Boletus pruinatus | a bolete | 2 | 2012 |
| fungus | Boletus pulverulentus | a bolete | 4 | 2010 |
| fungus | Boletus queletii | a bolete | 5 | 2001 |
| fungus | Boletus radicans | a fungus | 13 | 2011 |
| fungus | Boletus reticulatus | a bolete | 1 | 1997 |
| fungus | Boletus rubellus | a bolete | 3 | 2004 |
| fungus | Boletus satanas | Satan's Bolete | 2 | 1998 |
| fungus | Boletus subtomentosus | a bolete | 15 | 2012 |
| fungus | Botryobasidium aureum | a fungus | 2 | 2008 |
| fungus | Botryobasidium laeve | a basidiomycete fungus | 2 | 2014 |
| fungus | Botryotinia fuckeliana | an ascomycete fungus | 1 | 1999 |
| fungus | Bovista nigrescens | Brown Bovist | 9 | 2014 |
| fungus | Bovista plumbea | Lead-grey Bovist | 48 | 2015 |
| fungus | Bremia lactucae | an oomycete fungus | 2 | 2008 |
| fungus | Brevicellicium olivascens | a basidiomycete fungus | 1 | 2008 |
| fungus | Buelliella physciicola | a fungus | 1 | 1991 |
| fungus | Buerenia inundata | an ascomycete fungus | 1 | 1997 |
| fungus | Bulgaria inquinans | Black Bulgar | 22 | 2014 |
| fungus | Byssocorticium efibulatum | a fungus | 1 | 2014 |
| fungus | Byssomerulius corium | Netted Crust | 119 | 2020 |
| insect - true fly (Diptera) | Bradysia fungicola | a fly | 1 | 2001 |
| insect - true fly (Diptera) | Bradysia giraudii | a fly | 2 | 2008 |
| lichen | Bacidia bagliettoana | a lichen | 3 | 2018 |
| lichen | Bacidia fuscoviridis | a lichen | 2 | 2018 |
| lichen | Bacidia phacodes | a lichen | 1 | 1991 |
| lichen | Bacidia viridescens | a lichen | 1 | 1991 |
| lichen | Belonia calcicola | a lichen | 2 | 2005 |
| lichen | Belonia nidarosiensis | a lichen | 3 | 2018 |
| lichen | Bilimbia lobulata | a lichen | 1 | 2018 |
| lichen | Bilimbia sabuletorum | a lichen | 6 | 2018 |
| lichen | Blastenia crenularia | a lichen | 5 | 2010 |
| lichen | Botryolepraria lesdainii | a lichen | 11 | 2018 |
| lichen | Buellia aethalea | a lichen | 11 | 2016 |
| lichen | Buellia griseovirens | a lichen | 1 | 1996 |
| lichen | Buellia ocellata | a lichen | 12 | 2016 |
| lichen | Buellia saxorum | a lichen | 2 | 1985 |
| lichen | Buellia stellulata | a lichen | 3 | 2004 |
| mammal | Bos taurus | Domestic Cattle | 5 | 2019 |
| mammal - bat | Barbastella barbastellus | Barbastelle | 20 | 2019 |
| mammal - marine | Balaenoptera borealis | Sei Whale | 1 | 1925 |
| mammal - marine | Balaenoptera physalus | Fin Whale | 1 | 1885 |
| mayfly | Baetidae | a Baetidae mayfly (unidentified) | 36 | 2014 |
| mayfly | Baetis | a Baetis mayfly (unidentified) | 11 | 2018 |
| mayfly | Baetis muticus | a mayfly | 1 | 2008 |
| mayfly | Baetis rhodani | a mayfly | 25 | 2018 |
| mayfly | Baetis scambus | a mayfly | 1 | 2010 |
| millipede | Blaniulus guttulatus | a Spotted Snake Millipede | 7 | 2008 |
| millipede | Brachydesmus superus | a flat-back millipede | 2 | 1987 |
| mollusc | Balea (Balea) perversa | Wall Snail | 3 | 2002 |
| mollusc | Balea (Balea) sarsii | Tree Snail | 4 | 2015 |
| mollusc | Bathyomphalus contortus | a ramshorn snail | 185 | 2016 |
| mollusc | Bithynia leachii | a spire snail | 71 | 2013 |
| mollusc | Bithynia tentaculata | a spire snail | 252 | 2013 |
| mollusc | Bithyniidae | a Bithyniidae species (unidentified) | 2 | 2000 |
| mollusc | Bivalvia | a Bivalvia species (unidentified) | 1 | 2008 |
| mollusc | Boettgerilla pallens | Worm Slug | 2 | 1998 |
| mollusc | Buccinum undatum | Common Whelk | 10 | 2003 |
| moss | Barbula convoluta | Lesser Bird's-claw Beard-moss | 50 | 2019 |
| moss | Barbula sardoa | a moss | 5 | 2019 |
| moss | Barbula unguiculata | Bird's-claw Beard-moss | 44 | 2019 |
| moss | Brachytheciastrum velutinum | Velvet Feather-moss | 21 | 2011 |
| moss | Brachythecium | a Brachythecium moss (unidentified) | 4 | 2013 |
| moss | Brachythecium albicans | Whitish Feather-moss | 11 | 2016 |
| moss | Brachythecium appleyardiae | Appleyard's Feather-moss | 2 | 1990 |
| moss | Brachythecium glareosum | Streaky Feather-moss | 3 | 2019 |
| moss | Brachythecium mildeanum | Sand Feather-moss | 4 | 2011 |
| moss | Brachythecium rivulare | River Feather-moss | 13 | 2019 |
| moss | Brachythecium rutabulum | Rough-stalked Feather-moss | 246 | 2019 |
| moss | Bryoerythrophyllum recurvirostrum | Red Beard-moss | 18 | 2019 |
| moss | Bryophyta | a Bryophyta species (unidentified) | 8 | 2018 |
| moss | Bryopsida | a moss (unidentified) | 31 | 2015 |
| moss | Bryum | a Bryum moss (unidentified) | 9 | 2013 |
| moss | Bryum argenteum | Silver-moss | 38 | 2019 |
| moss | Bryum bicolor | Bicoloured Bryum | 5 | 2016 |
| moss | Bryum bicolor (sensu lato) | a moss | 2 | 1991 |
| moss | Bryum caespiticium | Tufted Thread-moss | 7 | 2015 |
| moss | Bryum canariense | Canary Thread-moss | 6 | 1998 |
| moss | Bryum capillare | Capillary Thread-moss | 96 | 2019 |
| moss | Bryum capillare var. capillare | a capillary thread-moss | 8 | 2003 |
| moss | Bryum dichotomum | a moss | 18 | 2019 |
| moss | Bryum donianum | Don's Thread-moss | 2 | 1990 |
| moss | Bryum dunense | Dune Thread-moss | 2 | 1990 |
| moss | Bryum funckii | Funck's Thread-moss | 1 | 1979 |
| moss | Bryum imbricatum | Small-mouthed Thread-moss | 1 | 1963 |
| moss | Bryum klinggraeffii | Raspberry Bryum | 2 | 2016 |
| moss | Bryum laevifilum | a moss | 1 | 2015 |
| moss | Bryum pallens | Pale Thread-moss | 8 | 2019 |
| moss | Bryum pallescens | Tall-clustered Thread-moss | 1 | 1990 |
| moss | Bryum pseudotriquetrum | Marsh Bryum | 4 | 2015 |
| moss | Bryum pseudotriquetrum var. pseudotriquetrum | a moss | 1 | 1986 |
| moss | Bryum radiculosum | Wall Thread-moss | 4 | 2020 |
| moss | Bryum rubens | Crimson-tuber Thread-moss | 17 | 2019 |
| moss | Bryum ruderale | Pea Bryum | 2 | 2015 |
| moss | Bryum subapiculatum | Lesser Potato Bryum | 2 | 1991 |
| moss | Bryum subelegans | Flabby Thread-moss | 3 | 2000 |
| moth or butterfly - butterfly | Boloria euphrosyne | Pearl-bordered Fritillary | 47 | 2003 |
| moth or butterfly - butterfly | Boloria selene | Small Pearl-bordered Fritillary | 272 | 2018 |
| moth or butterfly - butterfly | Boloria selene/euphrosyne | Small Pearl-bordered or Pearl-bordered Fritillary | 1 | 1999 |
| moth or butterfly - macro moth | Bembecia ichneumoniformis | Six-belted Clearwing | 40 | 2020 |
| moth or butterfly - macro moth | Bena bicolorana | Scarce Silver-lines | 71 | 2020 |
| moth or butterfly - macro moth | Biston betularia | Peppered Moth | 1328 | 2020 |
| moth or butterfly - macro moth | Biston betularia form carbonaria | Peppered Moth (melanic form) | 6 | 2013 |
| moth or butterfly - macro moth | Biston betularia form insularia | a moth | 4 | 2015 |
| moth or butterfly - macro moth | Biston betularia form typica | Peppered Moth (light) | 1 | 2016 |
| moth or butterfly - macro moth | Biston strataria | Oak Beauty | 309 | 2020 |
| moth or butterfly - macro moth | Boudinotiana notha | Light Orange Underwing | 26 | 2020 |
| moth or butterfly - macro moth | Brachylomia viminalis | Minor Shoulder-knot | 55 | 2013 |
| moth or butterfly - macro moth | Bryophila domestica | Marbled Beauty | 1675 | 2020 |
| moth or butterfly - macro moth | Bupalus piniaria | Bordered White | 43 | 2015 |
| moth or butterfly - micro moth | Bactra | a Bactra species (unidentified) | 2 | 2016 |
| moth or butterfly - micro moth | Bactra furfurana | a tortrix moth | 10 | 2017 |
| moth or butterfly - micro moth | Bactra lacteana | a moth | 1 | 2013 |
| moth or butterfly - micro moth | Bactra lancealana | Rush Marble | 88 | 2019 |
| moth or butterfly - micro moth | Bactra robustana | a tortrix moth | 3 | 2014 |
| moth or butterfly - micro moth | Batia | a Batia species (unidentified) | 1 | 2015 |
| moth or butterfly - micro moth | Batia lambdella | a micro-moth | 4 | 2018 |
| moth or butterfly - micro moth | Batia lunaris | a micro-moth | 53 | 2019 |
| moth or butterfly - micro moth | Batrachedra praeangusta | a micro-moth | 21 | 2018 |
| moth or butterfly - micro moth | Bedellia somnulentella | a micro-moth | 16 | 2017 |
| moth or butterfly - micro moth | Blastobasis adustella | Furness Dowd | 975 | 2020 |
| moth or butterfly - micro moth | Blastobasis lacticolella | a micro-moth | 144 | 2020 |
| moth or butterfly - micro moth | Blastodacna atra | Apple Pith Moth | 1 | 2003 |
| moth or butterfly - micro moth | Blastodacna hellerella | a micro-moth | 115 | 2019 |
| moth or butterfly - micro moth | Bohemannia pulverosella | a micro-moth | 8 | 2017 |
| moth or butterfly - micro moth | Bohemannia quadrimaculella | a micro-moth | 3 | 2011 |
| moth or butterfly - micro moth | Borkhausenia fuscescens | a micro-moth | 24 | 2018 |
| moth or butterfly - micro moth | Brachmia blandella | a micro-moth | 19 | 2018 |
| moth or butterfly - micro moth | Bryotropha | a Bryotropha species (unidentified) | 1 | 2007 |
| moth or butterfly - micro moth | Bryotropha affinis | a micro-moth | 80 | 2019 |
| moth or butterfly - micro moth | Bryotropha basaltinella | a micro-moth | 3 | 2007 |
| moth or butterfly - micro moth | Bryotropha domestica | a micro-moth | 102 | 2019 |
| moth or butterfly - micro moth | Bryotropha senectella | a micro-moth | 18 | 2016 |
| moth or butterfly - micro moth | Bryotropha terrella | Cinerous Groundling | 110 | 2019 |
| moth or butterfly - micro moth | Bucculatrix | a Bucculatrix micro-moth (unidentified) | 1 | 2006 |
| moth or butterfly - micro moth | Bucculatrix bechsteinella | a micro-moth | 1 | 2018 |
| moth or butterfly - micro moth | Bucculatrix cidarella | a micro-moth | 1 | 2001 |
| moth or butterfly - micro moth | Bucculatrix cristatella | a micro-moth | 1 | 2016 |
| moth or butterfly - micro moth | Bucculatrix frangutella | a micro-moth | 1 | 1993 |
| moth or butterfly - micro moth | Bucculatrix maritima | a micro-moth | 10 | 2016 |
| moth or butterfly - micro moth | Bucculatrix nigricomella | a micro-moth | 9 | 2017 |
| moth or butterfly - micro moth | Bucculatrix thoracella | a micro-moth | 39 | 2019 |
| moth or butterfly - micro moth | Bucculatrix ulmella | a micro-moth | 11 | 2019 |
| plant | Baldellia ranunculoides | Lesser Water-plantain | 44 | 2013 |
| plant | Ballota nigra | Black Horehound | 480 | 2019 |
| plant | Ballota nigra subsp. meridionalis | a flowering plant | 63 | 2012 |
| plant | Bambusa | a Bambusa bamboo (unidentified) | 6 | 2013 |
| plant | Bambusa sp. or Sasa sp. or Sasaella sp. (unidentified bamboo) | a bambusa or a sasa or a sasaella bamboo (unidentified) | 2 | 2015 |
| plant | Barbarea | a winter-cress (unidentified) | 4 | 2008 |
| plant | Barbarea intermedia | Medium-flowered Winter-cress | 36 | 2007 |
| plant | Barbarea stricta | Small-flowered Winter-cress | 1 | 1994 |
| plant | Barbarea verna | American Winter-cress | 21 | 2018 |
| plant | Barbarea vulgaris | Winter-cress | 694 | 2019 |
| plant | Bartsia alpina | Alpine Bartsia | 1 | 1999 |
| plant | Bassia scoparia | Summer-cypress | 18 | 2008 |
| plant | Beckmannia eruciformis | European Slough-grass | 2 | 1985 |
| plant | Beckmannia syzigachne | American Slough-grass | 2 | 1930 |
| plant | Bellis perennis | Daisy | 6218 | 2020 |
| plant | Berberis | a barberry (unidentified) | 13 | 2016 |
| plant | Berberis aggregata | Clustered Barberry | 1 | 2013 |
| plant | Berberis darwinii | Darwin's Barberry | 7 | 2014 |
| plant | Berberis darwinii x empetrifolia = B. x stenophylla | Hedge Barberry | 5 | 2019 |
| plant | Berberis julianae | Chinese Barberry | 2 | 2016 |
| plant | Berberis thunbergii | Thunberg's Barberry | 3 | 2019 |
| plant | Berberis vulgaris | Barberry | 15 | 2014 |
| plant | Berberis wilsoniae | Mrs Wilson's Barberry | 1 | 1997 |
| plant | Bergenia | a Bergenia species (unidentified) | 2 | 2013 |
| plant | Bergenia crassifolia | Elephant-ears | 8 | 2016 |
| plant | Berteroa incana | Hoary Alison | 2 | 1934 |
| plant | Berula | a Berula species (unidentified) | 2 | 1993 |
| plant | Berula erecta | Lesser Water-parsnip | 821 | 2018 |
| plant | Beta vulgaris | Beet | 9 | 2015 |
| plant | Beta vulgaris subsp. cicla | Foliage Beet | 2 | 1992 |
| plant | Beta vulgaris subsp. maritima | Sea Beet | 402 | 2019 |
| plant | Beta vulgaris subsp. vulgaris | Root Beet | 5 | 1998 |
| plant | Betula | a birch (unidentified) | 189 | 2019 |
| plant | Betula albosinensis | White Birch | 1 | 1984 |
| plant | Betulaceae | a Betulaceae species (unidentified) | 1 | 2012 |
| plant | Betula ermanii | Erman's Birch | 1 | 2015 |
| plant | Betula nigra | Black Birch | 1 | 2000 |
| plant | Betula papyrifera | Paper Birch | 2 | 2015 |
| plant | Betula pendula | Silver Birch | 1622 | 2019 |
| plant | Betula pendula x pubescens = B. x aurata | a flowering plant | 3 | 2000 |
| plant | Betula pubescens | Downy Birch | 48 | 2017 |
| plant | Betula pubescens subsp. pubescens | a downy birch (subsp. pubescens) | 65 | 2005 |
| plant | Betula utilis | Himalayan Birch | 42 | 2015 |
| plant | Bidens aristosa | a flowering plant | 1 | 1959 |
| plant | Bidens cernua | Nodding Bur-marigold | 8 | 2016 |
| plant | Bidens ferulifolia | a flowering plant | 1 | 2013 |
| plant | Bidens frondosa | Beggarticks | 17 | 2016 |
| plant | Bidens pilosa | Black-jack | 1 | 1926 |
| plant | Bidens tripartita | Trifid Bur-marigold | 145 | 2019 |
| plant | Bifora radians | a flowering plant | 4 | 1954 |
| plant | Bifora testiculata | a flowering plant | 1 | 1917 |
| plant | Blackstonia perfoliata | Yellow-wort | 468 | 2020 |
| plant | Blechnum spicant | Hard Fern | 83 | 2019 |
| plant | Blysmus compressus | Flat-sedge | 9 | 2014 |
| plant | Bolboschoenus maritimus | Sea Club-rush | 249 | 2019 |
| plant | Borago officinalis | Borage | 85 | 2019 |
| plant | Botrychium lunaria | Moonwort | 20 | 2009 |
| plant | Brachyglottis compacta x laxifolia = B. 'Sunshine' | Shrub Ragwort | 4 | 2013 |
| plant | Brachypodium distachyon | Stiff Brome | 1 | 1938 |
| plant | Brachypodium pinnatum | Tor-grass | 136 | 2016 |
| plant | Brachypodium pinnatum s.l. | a tor-grass | 2 | 2013 |
| plant | Brachypodium rupestre | a flowering plant | 7 | 2019 |
| plant | Brachypodium sylvaticum | False-brome | 4198 | 2020 |
| plant | Brassica | a cabbage (unidentified) | 20 | 2018 |
| plant | Brassicaceae | a crucifer (unidentified) | 3 | 2016 |
| plant | Brassica elongata | Long-stalked Rape | 2 | 1927 |
| plant | Brassica juncea | Chinese Mustard | 14 | 2008 |
| plant | Brassica napus | Rape | 221 | 2019 |
| plant | Brassica napus subsp. oleifera | Oil-seed Rape | 26 | 2017 |
| plant | Brassica napus subsp. rapifera | Swede | 1 | 1931 |
| plant | Brassica nigra | Black Mustard | 393 | 2019 |
| plant | Brassica oleracea | Cabbage (plant) | 4 | 2016 |
| plant | Brassica oleracea var. oleracea | Wild Cabbage | 5 | 1992 |
| plant | Brassica rapa | Turnip | 67 | 2019 |
| plant | Brassica rapa subsp. campestris | Wild Turnip | 121 | 2018 |
| plant | Briza maxima | Greater Quaking Grass | 20 | 2016 |
| plant | Briza media | Quaking-grass | 1686 | 2020 |
| plant | Briza minor | Lesser Quaking-grass | 2 | 1996 |
| plant | Bromopsis benekenii | Lesser Hairy-brome | 1 | 1991 |
| plant | Bromopsis erecta | Upright Brome | 1752 | 2019 |
| plant | Bromopsis inermis subsp. inermis | a hungarian brome | 5 | 1986 |
| plant | Bromopsis ramosa | Hairy Brome | 982 | 2019 |
| plant | Bromus | a Bromus species (unidentified) | 10 | 2020 |
| plant | Bromus arvensis | Field Brome | 3 | 1932 |
| plant | Bromus commutatus | Meadow Brome | 237 | 2019 |
| plant | Bromus danthoniae | a flowering plant | 2 | 1938 |
| plant | Bromus diandrus | Great Brome | 53 | 2016 |
| plant | Bromus hordeaceus | Soft-brome | 825 | 2019 |
| plant | Bromus hordeaceus subsp. ferronii | Least Soft-brome | 6 | 2015 |
| plant | Bromus hordeaceus subsp. hordeaceus | Common Soft-brome | 1603 | 2020 |
| plant | Bromus hordeaceus subsp. longipedicellatus | a flowering plant | 1 | 2012 |
| plant | Bromus hordeaceus subsp. molliformis | Divergent Soft-brome | 1 | 1984 |
| plant | Bromus hordeaceus x lepidus = B. x pseudothominei | Lesser Soft-brome (hybrid) | 38 | 2001 |
| plant | Bromus interruptus | Interrupted Brome | 1 | 1930 |
| plant | Bromus japonicus | Thunberg's Brome | 3 | 1955 |
| plant | Bromus lepidus | Slender Soft-brome | 13 | 2011 |
| plant | Bromus madritensis | Compact Brome | 34 | 2016 |
| plant | Bromus racemosus | Smooth Brome | 128 | 2019 |
| plant | Bromus rubens | Foxtail Brome | 2 | 1939 |
| plant | Bromus secalinus | Rye Brome | 20 | 2016 |
| plant | Bromus squarrosus | Rough Brome | 1 | 1931 |
| plant | Bromus sterilis | Barren Brome | 2742 | 2020 |
| plant | Bromus tectorum | Drooping Brome | 3 | 1939 |
| plant | Brunnera macrophylla | Great Forget-me-not | 16 | 2019 |
| plant | Bryonia dioica | White Bryony | 1362 | 2020 |
| plant | Bryonia sp. or Tamus sp (unidentified bryony). | a bryony (unidentified) | 317 | 2010 |
| plant | Buddleja | a butterfly-bush (unidentified) | 24 | 2014 |
| plant | Buddleja davidii | Buddleia | 2180 | 2020 |
| plant | Buddleja davidii x globosa = B. x weyeriana | a butterfly-bush | 1 | 1990 |
| plant | Buddleja globosa | Orange-ball-tree | 2 | 2011 |
| plant | Bunias erucago | Southern Warty-cabbage | 2 | 1940 |
| plant | Bunias orientalis | Warty Cabbage | 5 | 2014 |
| plant | Bupleurum subovatum | False Thorow-wax | 3 | 1988 |
| plant | Bupleurum tenuissimum | Slender Hare's-ear | 72 | 2015 |
| plant | Butomus umbellatus | Flowering Rush | 148 | 2019 |
| plant | Buxus | a Buxus species (unidentified) | 2 | 2010 |
| plant | Buxus balearica | Balearic Box | 2 | 2011 |
| plant | Buxus sempervirens | Box | 314 | 2019 |
| slime mould | Badhamia affinis | a slime mould | 2 | 2008 |
| slime mould | Badhamia macrocarpa | a slime mould | 1 | 1998 |
| slime mould | Badhamia panicea | a slime mould | 4 | 2008 |
| slime mould | Badhamia utricularis | a slime mould | 1 | 2013 |
| slime mould | Brefeldia maxima | a slime mould | 2 | 2008 |
| spider | Ballus chalybeius | a jumping spider | 1 | 1991 |
| spider | Bathyphantes gracilis | a money spider | 41 | 2003 |
| spider | Bathyphantes nigrinus | a money spider | 5 | 1999 |
| spider | Bathyphantes parvulus | a money spider | 3 | 1996 |
| stick insect | Bacillus rossius | an insect - stick insect (Phasmida) | 1 | 2020 |
| tick or mite (acarine) | Bdellidae | a snout mite (unidentified) | 1 | 2015 |
| tick or mite (acarine) | Bryobia | a clover mite (unidentified) | 2 | 2013 |
| tick or mite (acarine) | Bryobia praetiosa | Clover Mite | 2 | 2013 |
| true fly - | Beckerina umbrimargo | a scuttle fly | 1 | 2003 |
| true fly - | Bellardia pandia | a blue bottle or green bottle | 1 | 2008 |
| true fly - | Bellardia vulgaris | a blue bottle or green bottle | 4 | 2013 |
| true fly - | Bibio | a Bibio true fly (unidentified) | 1 | 2006 |
| true fly - | Bibio johannis | Black Gnat | 11 | 2019 |
| true fly - | Bibio lanigerus | a st mark's fly | 1 | 2017 |
| true fly - | Bibio marci | St Marks Fly | 90 | 2019 |
| true fly - | Bibionidae | a St Marks fly (unidentified) | 1 | 2006 |
| true fly - | Bibio nigriventris | a st mark's fly | 1 | 1969 |
| true fly - | Bibio pomonae | a st mark's fly | 1 | 1990 |
| true fly - | Bibio varipes | a st mark's fly | 1 | 2017 |
| true fly - | Bibio venosus | a st mark's fly | 1 | 1990 |
| true fly - | Bithia spreta | a parasitic fly | 3 | 2004 |
| true fly - | Bombylius | a bee-fly or bee fly (unidentified) | 11 | 2015 |
| true fly - | Botanophila lobata | a fly | 2 | 2013 |
| true fly - | Botanophila varicolor | a fly | 3 | 2004 |
| true fly - | Brachicoma devia | a flesh fly | 2 | 2003 |
| true fly - | Bradysia | a Bradysia species (unidentified) | 4 | 1997 |
| true fly - | Bradysia aprica | a fly | 2 | 1995 |
| true fly - | Bradysia tilicola | a fly | 1 | 2001 |
| true fly - | Brontaea humilis | a muscid fly | 1 | 2001 |
| true fly - bee-fly | Bombylius canescens | Western Bee-fly | 14 | 2011 |
| true fly - bee-fly | Bombylius discolor | Dotted Bee-fly | 42 | 2020 |
| true fly - bee-fly | Bombylius major | Bee-fly | 333 | 2020 |
| true fly - (diptera) | Botanophila brunneilinea | an insect - true fly (Diptera) | 3 | 2013 |
| true fly - (diptera) | Botanophila fugax | an insect - true fly (Diptera) | 13 | 2008 |
| true fly - (diptera) | Botanophila striolata | an insect - true fly (Diptera) | 10 | 2013 |
| true fly - (diptera) | Bradysia nitidicollis | an insect - true fly (Diptera) | 1 | 2013 |
| true fly - (diptera) | Bradysia placida | an insect - true fly (Diptera) | 1 | 1997 |
| true fly - hoverfly | Baccha | a Baccha hoverfly (unidentified) | 7 | 2001 |
| true fly - hoverfly | Baccha elongata | a hoverfly | 46 | 2020 |
| true fly - hoverfly | Brachyopa insensilis | a hoverfly | 1 | 1950 |
| true fly - hoverfly | Brachyopa pilosa | a hoverfly | 1 | 1948 |
| true fly - hoverfly | Brachyopa scutellaris | a hoverfly | 5 | 2016 |
| true fly - hoverfly | Brachypalpoides lentus | a hoverfly | 4 | 2015 |
| true fly - hoverfly | Brachypalpus laphriformis | a hoverfly | 6 | 2003 |
| true fly - midge, gnat or mosquito | Boletina basalis | a fungus gnat | 1 | 2000 |
| true fly - midge, gnat or mosquito | Boletina dispecta | a fungus gnat | 1 | 1930 |
| true fly - midge, gnat or mosquito | Boletina dubia | a fungus gnat | 1 | 2001 |
| true fly - midge, gnat or mosquito | Boletina nitida | a fungus gnat | 2 | 2000 |
| true fly - midge, gnat or mosquito | Boletina trivittata | a fungus gnat | 1 | 1998 |
| true fly - midge, gnat or mosquito | Bolitophila cinerea | a fungus gnat | 2 | 2003 |
| true fly - midge, gnat or mosquito | Bolitophila modesta | a fungus gnat | 1 | 2001 |
| true fly - midge, gnat or mosquito | Bolitophila occlusa | a fungus gnat | 1 | 2001 |
| true fly - midge, gnat or mosquito | Bolitophila saundersii | a fungus gnat | 5 | 2003 |
| true fly - midge, gnat or mosquito | Brachypeza armata | a fungus gnat | 1 | 1985 |
| true fly - midge, gnat or mosquito | Brevicornu fissicauda | a fungus gnat | 2 | 2001 |
| true fly - midge, gnat or mosquito | Brevicornu griseicolle | a fungus gnat | 8 | 2003 |
| true fly - midge, gnat or mosquito | Brevicornu sericoma | a fungus gnat | 7 | 2003 |
| true fly - midge, gnat or mosquito | Bryophaenocladius vernalis | a non-biting midge | 1 | 2020 |
| true fly - robber, empid or dolichopid fly | Bicellaria vana | a dance fly | 16 | 2008 |
| true fly - soldier or snipe fly | Beris chalybata | Murky-legged Black Legionnaire | 15 | 2018 |
| true fly - soldier or snipe fly | Beris clavipes | Scarce Orange Legionnaire | 6 | 2018 |
| true fly - soldier or snipe fly | Beris fuscipes | Short-horned Black Legionnaire | 2 | 2000 |
| true fly - soldier or snipe fly | Beris geniculata | Long-horned Black Legionnaire | 8 | 2016 |
| true fly - soldier or snipe fly | Beris morrisii | Yellow-legged Black Legionnaire | 14 | 2003 |
| true fly - soldier or snipe fly | Beris vallata | Common Orange Legionnaire | 53 | 2019 |
| tunicate (urochordata) | Botrylloides leachii | a tunicate (Urochordata) | 1 | 2016 |
| tunicate (urochordata) | Botryllus schlosseri | Star Squirt | 2 | 1972 |
| woodlouse | Buddelundiella cataractae | a woodlouse | 1 | 2015 |