Alan Cassidy is the Daddy (or Uncle as he's known). Current British aerobatic team boss, there's not much he doesn't know about aeros. He has also published a very good book called Better Aerobatics which won't be too difficult to find.
Also, have a look at the
BAeA website for a list of aerobatic schools (Pilot briefing / aerobatic training) .
Here is a link to Alan Cassidy's website.