Rick Stein's Seafood
Thanks for everyone's advice on which fish book I should buy.
As you may have gathered from the title of this post, I went with Rick Stein's Seafood. Rather, I should say Silverbrowess went with your advice and bought it for me - one of the many reasons I love her.
As I said in the original post, I was after a book that would teach me from first principles and this is just what Seafood does. The Cook's Book is good on fish technique, but almost inevitably, it is nowhere nearly as detailed as this. Hugh is still very much on my wish list, but only once I've channelled Rick.