I'm in London and it's true, England does seem to be behind a bit where TMJD treatment is concerned. I finally got a diagnosis on Thursday from the Eastman Dental Hospital in London. They X rayed me and my problem is muscular, I've been put on a muscle relaxant and am having a splint made. The consultant I saw explained that they only use 'conservative' treatment at The Eastman. In their opinion there isn't enough evidence to back up the use of anterior repositioning splints, and they feel they can make things worse. Obviously I have been on this board, so know that there are many differing opinions on this, and also good outcomes from this type of treatment. Fortunately, in my case their approach isn't a problem as my tmjd is muscular, so a repositioning splint probably doesn't apply to me. Although if the treatment from The Eastman doesn't work I may have to look elsewhere for people who do believe in other treatments. I did ask what they would do if someone's tm joints were out of place - she wasn't keen to talk about it as it wasn't relevant to me. I did feel however, that the consultant I saw was at least very knowledgeable about tmjd, she took me through my X ray and explained what the joint would look like if it was a joint problem. She was also aware of other types of treatments, just didn't believe in them.
Basically I do think it might be worth getting a referral to the Eastman anyway, it's NHS, and they are quite a famous dental hospital. They might have a different response if someone has actually had an injury to the jaw, especially if you can't close your mouth properly. If they prove to be hopeless, then you're no worse off than you are now. They were also very nice, and took jaw pain and in my case the ear problems I experience very seriously.
Hope this helps a bit.