There are many excellent field guides and general wildlife books available. A few examples are listed below.

Britain’s Butterflies. David Tomlinson and Rob Still (2004). Wild Guides. ISBN 1903657016. Paperback

Chris Packham's Back Garden Nature Reserve, Chris Packham (2001), New Holland Publishers, ISBN 1859745202. Hardback

Collins Bird Guide. Killian Mullarney, Lars Svensson, Dan Zetterström and Peter J Grant (2001). HarperCollinsPublishers. ISBN 0007113323. Paperback

Collins Field Guide: Butterflies of Britain and Europe. Tom Tolman and Richard Lewington (2004). HarperCollinsPublishers. ISBN: 0007189915. Hardback

Collins Pocket Guide: Wild Flowers of Britain and Northern Europe. Richard Fitter, Alastair Fitter and Marjorie Blamey (1996). HarperCollinsPublishers. ISBN 0002200627. Paperback

Creating a Flower Meadow. Yvette Verner (1999). Green Books Ltd. ISBN 1900322080. Paperback

Creating a Wildlife Garden: How to turn your garden into a wildlife haven Bob and Liz Gibbons (1996). Bounty Books.  ISBN 1851529357. Paperback

Field Guide to the Dragonflies and Damselflies of Great Britain and Ireland. Steve Brooks and Richard Lewington (1999). British Wildlife Publishing. ISBN 0953139905. Paperback

Field Guide to the Moths of Great Britain and Ireland. Paul Waring and Martin Townsend and Richard Lewington (2003). British Wildlife Publishing. ISBN 0953139921. Paperback

Flora Britannica – The Concise Edition. Richard Mabey (1998). Chatto & Windus. ISBN 0701167319. Hardback

How to Make a Wildlife Garden. Chris Baines (2000). Frances Lincoln. ISBN 0711217114. Paperback.

Mammals, Reptiles and Amphibians of Britain and Europe. P.Morrison (1994). Pan Macmillan. ISBN: 0333629981. Hardback

Nick Baker’s British Wildlife – A Month by Month Guide (The Wildlife Trusts). Nick Baker (2003). New Holland Publishers (UK) Ltd. ISBN 1843300605. Hardback.

Observers Pond Life. John Clegg (1986). Bloomsbury Books. ISBN 185471063X. Hardback

Pocket Guide to Butterflies of Great Britain and Ireland. Richard Lewington (2003). British Wildlife Publishing. ISBN: 0953139913. Paperback

Saving Butterflies. David Dunbar (1993). Butterfly Conservation. ISBN 0951245295. Paperback

Secret Nature of Devon. Andrew Cooper (2005). Green Books Ltd. ISBN 1903998506. Paperback

The Amateur Naturalist: The Classic Practical Guide to the Natural World. Gerald and Lee Durrell (1993). Dorling Kindersley. ISBN 0863188702. Paperback

The BTO Nestbox Guide. Chris du Feu (2003). British Trust for Ornithology. ISBN: 1902576810. Paperback

The New Handbook of British Mammals. S Harris (2007) T & AD Poyser Ltd (A & C Black). ISBN: 0713665475 . Paperback

The Wild Flower Key - How to identify wild flowers, trees and shrubs in Britain and Ireland. Francis Rose and Clare O'Reilly (2006). Frederick Warne Books. ISBN: 0723251754. Paperback

The Wildlife Pond Handbook: A practical guide to creating and maintaining your own wetland for wildlife. Louise Bardsley (2003). The Wildlife Trusts. New Holland Publishers Ltd. ISBN 1843301113.  Hardback.

Wild Flowers of Britain and Ireland – Domino Guide. Marjorie Blamey, Richard Fitter and Alastair Fitter (2003). A & C Black Publishers Ltd. ISBN 0713659440. Paperback