Hi - I use Anthony Perkins - excellent! Carol Stone is also really good. I could send you a few numbers if you like. We are just outside Melksham so must be really close!
I would second Carol Stone - I went to a training session with KVRC once and she was excellent
Janet Robinson is very good for dressage, she taught me to ride when I was young, but is equally good at teaching adults - I went to her when we were trying our hand at stressage a couple of years ago and she was ace! Lots of people would recommend her - I appear to have mislaid her number, but I know she does a lot of riding club stuff - Swindon & District I think - so she wouldnt be hard to track down