UKMoths 
Field Guide to the Moths of Great Britain and Ireland
The New British moth enthusiast's 'bible' - over 1600 high quality illustrations of more than 880 of the larger (macrolepidoptera) species.
Concise Guide to the Moths of Great Britain and Ireland - second edition
This companion guide to the "Field Guide" is a handy, ring-bound and condensed format ideal for taking out in the field or comparing live specimens to the plates.
Field Guide to the Micro moths of Great Britain and Ireland
An essential guide to the smaller or 'Micro' lepidoptera of Britain, over 1500 high quality plates and photos, bringing together these previously difficult insects together in one handy volume for the first time.
British Moths - a Photographic Guide to the Moths of Great Britain and Ireland
The second edition of Chris Manley's superb photographic guide concentrates on the moths and loses the first edition's butterflies; it contains more of the 'micro moths' as well as many new photos and improvements.
The Colour Identification Guide to Moths of the British Isles
An excellent companion to the 'Field Guide' above - over 800 species illustrated.
The Colour Identification Guide to Caterpillars of the British Isles
Over 850 species of British caterpillar brought together in one volume.
Britain's Day-Flying Moths: A Field Guide to the Day-Flying Moths of Britain and Ireland
A handy concise guide to the moths you're likely to encounter during the daytime.
Moths of Europe Volume 1 Saturnids, Lasiocampids, Hawkmoths, Tiger Moths..
Saturnids, Lasiocampids, Hawkmoths, Tiger Moths... Volume 1 of a collection of 4 volumes covering most of the moths of Europe.
Moths of Europe Volume 2
Geometridae... Volume 2 of a collection of 4 volumes covering most of the moths of Europe
British Pyralid Moths - a Guide to their Identification
A more serious introduction to the enigmatic microlepidoptera that make up the Pyralidae.