I agree with Jim59, when I studied for my UK PPL back in the 80s I used Trevor Thom's very well written and detailed series of books. If they are still being published and in use I can highly recommend them. As also holding FAA professional licences and having flown in the US for 30 years I would advise against using the FAA written material if you intend to learn to fly in the UK. There are too many procedural and terminology differences.