I use A.K Duncan vets in wollaston if your interested Alison
Although they aren't the best at handling hamsters and sometimes need a little help, the vet is so lovely and genuinely loves them.
I've regularly had teeth clipping and also treatment for cystitus with no problem. They are very reasonable with prices also
(costs me £9 for a teeth clip, between £15-£30 for consultation and meds)