Fiona Foy is brilliant! She has a website, I know she has a clinic at Manor Farm in Teffont (between Salisbury and Shaftesbury) on Saturday, perhaps you could go along to watch for a while? Where abouts in South Wiltshire are you? Tracey Crutcher is also very good, she's based in Shaftesbury.
I would highly recommend my trainer Jayceson Pferdmitfahrer (pronounced Jason). He is classically german trained and is amazing. He is extremely knowledgeable and his no1 priority is the horse. He tells it as he see it though in a nice way and really works to improve the horse to it's maximum but at the horses pace. I have known him for 3 years and he is brilliant. He will travel a long way for clients.
His website is www.continentalhorses.com .
Hope this helps, please feel free to pm me for any for info.
I run clinics at our yard with Peter maddison greenwell who is amazing http://www.elcaballodeespana.co.uk/
i think we are about an hour and a 1/2 from you but its well worth the trip we have a lady comming all the way from Abergavenny this weekend!