I've got British Sea Fishes by Francis Dipper (
Divernet - Diver Magazine Online | SCUBA | Diving | Dive Shows | Gear Tests | Travel | News. OK, it only covers fish, but it does it very well. It's nicely divided into habitats and has helped on many occasion to identifying things. I've often referred to it as "the trainspotters guide to fish" - but that's supposed to be a complement!
Rob
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East Midlands Underwater Photographers www.emup.org.uk www.robcuss.co.uk
Camera kit: Nikon D80 in Ikelite housing, Tokina 10-17mm, Sigma 50mm, Sigma 105mm, twin Ikelite DS-125 strobes