Wandered in to WH Smith after being taken to the cleaners by The Highway Robbery Team aka The Dentist and found a book called 'Photoshop for Photographers'.
It's published by Future and costs £12.99 and has over 220 pages of techniques covering such things as 'Recover blown-out highlight detail', 'Remove blemishes and other unwanted objects', 'Add dramatic skies' etc etc.
There tons and tons of step by step techniques. A lot of them are taken from the magazine but there's a cd included so you can follow the techniques with the image provided.
I'm pleased with my purchase!