I think your depression and other problems are being exacerbated by the natural feelings of culture shock. Google it, or see my post about the book somewhere on this forum.
It's totally normal for people living in a different culture to feel exactly the way you do, even at this precise length of time after the move. And depression is one of the biggest symptoms. It's been scientifically studied and the pattern of feelings has been graphed.
The good news is that just in the same way it's so predictable that it's going to happen, it's also predictable that those feelings will lesson over time and you will eventually fit in, feel better, and start to get into a normal British life. There's practical things you can do to lessen the effects, mostly things like exercise, hang out with locals, get involved in local stuff, stop complaining about the way "they" do things here and try to understand why.
Hope this helps