I recommed Jo Cooper, she usues TFT, but is also qualified in the psychological therapy Neurolinguistic Programming and so can use a wider range of skills to address your problem if need be. Her prices started low a few years ago whilst she established that her therapy worked well for riding problems. I know that she kept them low for a long time, but she has had to put them up as it is how she makes her living.
Check out her website as detailed above. I can vouch for her, she did wonders for me