It wasn't classical style, but a friend of mine had a very nice ride while she was down in Cornwall; at a place where the owner is a lady who breeds arabs and does endurance with them. I can ask her if you like?
Otherwise, I'd found somewhere called Bluehorse, who used to do classical stuff, but I'm not sure what they now offer; they mention clinics, but don't know if that's with their horses, your own, or what. I also don't know what they're like, but maybe someone else does?
http://www.bosneivesmill.com/bosneivesmill/I'm sure you'll find something, though. Do you think you might be up for Gilfach in August, btw???
