I don't live in the UK, so I can't tell you anything about that, unfortunately.
I wanted to ask what sort of things you were doing to try to make friends, though. I find it extremely difficult to do that sort of thing. My lovely sis recommended
http://www.meetup.com/ , which apparently has a UK section. I've found an awful lot of groups, the existence of whom I would never have suspected, there. Haven't actually gone, though, for various reasons :P
Kind of weird that there aren't real life forums for dealing with depression, when obviously there's such a great big community online, but honestly, wouldn't you rather go to the Ghost Tracking club (ghosts.meetup.com) than sit around with all those sad sacks?
I'm sort of on the fence about it, but I think the best policy is to try to keep the discussion of depression out of your real life, if making friends is your #1 priority. Once you've found a few you can trust, you can engage them in conversation about it. But critically, we need to go out and have fun from time to time, and forget about this moping we do.
See you at the Ghost Tracking Club! *hug*