EAMom - thanks for the addresses. I'd written to all of them before, asking if they knew anyone I could get to from where I live (they're all too far south), and was just a bit unnerved by the way none of them mentioned PANDAS in their replies, just said they didn't happen to know any adult psychiatrists in my area! So I was beginning to wonder if any of them really did do PANDAS. Peter Hill actually said that he thought PANDAS was usually best treated like any other form of OCD.
But since I made that posting I've FOUND SOMEONE! As usual he's based in London but he does occasional clinics in Manchester, and I've got an appointment on Tuesday (shorter notice than usual, too - someone cancelled). Wish me luck :-) :-) :-)
Lauren and Stephanie - thanks, that's very encouraging! I'll remember about the homoeopath, too. I did see a local homoeopath for quite a while, with entirely random effects, but then I don't think she knew a whole lot about the condition - she did her level best, but I noticed she did keep on quizzing me about my emotions, rather as if she thought that was at the bottom of it. (And it hadn't even occurred to me it might be PANDAS at that point.)