I used that lady the other mentioned but had a bad experience, she over stretched my horses front leg making it chronically lame it could barely weight bare - she did say that had never happened to her before and was clearly upset, but still my horse was off for nearly 3 months and I got a £700 vet bill , vet had to scan it and other things - turns out when she pulled the leg forward the muscle was tight and got badly damaged in between her front legs. Took ages to heal , I was pretty annoyed as vet said you should never of pulled a horses leg that far up and forward when horse muscle was cold.
I know you said physio but i had to mention Liz Jones who is a McTimoney and she literally saved my main sheep dog from retirement due to a pelvis injury 2 years ago (vet couldn't find anything wrong and pain killers did nothing), bitch is still going strong and running in a major sheep dog trial this week. I have heard she is brilliant with horses too.
Another vote for Tara, she did physio for my mare a few months ago and it really helped her sore back ...i was quite amazed at how my mare reacted/responded! Just one treatment was all that was needed in my horses case.
I've heard good things about Tara Jamieson and Pauline Kidd. Personally Ive used Grania Ingleby who is excellent, she "fixed" a back problem my horse had with very visible results. Her number is 07793 886182.