Hi Storm,
Have you heard of The Hand equestrian centre? It's about 5mins from a tesco store (sorry havent got a clue which one!). I believe its in the clevedon area. We are from bristol and travel 30mins every wednesday to one close to the Hand stadium, about 10mins past bristol airport. I think we've got quite a waiting list but I'm not sure about the one at The Hand equestrian centre, but if you're interested I could give you a phone number.
Char