Alan Cassidy offers aeros training in a Pitts at White Waltham and is indeed highly regarded. A mate of mine is training with him at present and is very impressed. There's also aeros training available at Old Sarum and, I believe, Compton Abbas. For both Rightstuff and Loglickychops, might I suggest a Cap 10? Not as ballistic as a Pitts or Extra, much more grunty than a Citabria, a bit more flingable than a Slingsby, less mega-donked than a Yak but less thirsty, and tail wheeled to boot. Email me at pprune mail if interested.