Hi there!
Yes, I'm in Bristol!
I'm not completely 'clued up' on which vet does what in the area, but I can recommend the vet I use which is also used by Cats Protection. They may be able to refer you to another practice that specialises in elderly cats, if they don't do so themselves (mine are all quite young). The vet in question is Fernlea Vets - they have two surgeries in Bristol. Google and they'll come to the top of the list. They are extremely sympathetic and friendly, and wonderful with the animals - they treat each and every one with loads of love and care
They don't do impersonal. The only drawback is that they don't offer a 24-hour surgery, but there's emergency vets in Bristol if required. Two of my friends have already switched to Fernlea cause they're so good with the animals