The several forums I found googling seem to be mostly or entirely moribund. Has everyone moved here?
I see you've just joined recently. Welcome! Although I'm from the US, I can assure you that there are many discussions here that are UK-specific. They relate to things like finding a good doctor, support group, the politics of medicine in the UK, the Department of Work and Pensions, the SMC, etc.
There are also a large number of members here from Australia, New Zealand, Canada and some from non-English countries such as France, Germany and Spain. So if you speak English, I think you've found a good place! And even if English is not your native language, you still might like the place.