Might be a bit late, but David Cox and Michael Fardon book is the best resource I can find it's got so many examples. Past questions/different exam boards. All to do with this AQA specification. User friendly layout good chapter summaries; explains key concepts aswell as harder examples. Very good book highly recommended. I read through it 3 times, done a few past papers, in my college mock week I got a high B in the June 2013 paper which was extremely difficult in my opinion.