Highcroft vets.
The one in Whitchurch I'm particular. It's the one I use and where we were referred to see a zoo vet for Marble from Taunton and the practice that have done amazingly well with Billy and referred us to Richard Saunders.
Also, Avenue Vets in Staple Hill (I think) - recommended to me by RWAF. Can't remember the name of the vet but she was lovely.
Also there's a Bristol Hopper Group full of people who give great advice and could also advise on vets in their areas of Bristol.