Well done Greg.
You can do the exams at any flying school. They'll charge about twenty squids per exam. You have (I think) three attempts at each exam. (Make sure you get your exam passes signed and dated (or stamped); they should give you a form for this. you'll need it later on.) But they're not difficult if you have studied. I was also self-taught; but I never got on with my teacher!!!
You should get yourself a copy of LASORS. You can download it for free, or you can buy a copy from the CAA. Here's the link for the download.
http://www.caa.co.uk/application.asp...detail&id=1591
Pprune is a very useful tool also. However, you should make full use of the search function before you ask about anything and everything. Most of the time the answers are there, somewhere. You just need to find them. But if you're having difficulty finding out about something, or whatever, there's usually someone out here who can help.
Enjoy your flying,
Pig