London is my least favourite place in the UK. It would be my personal hell to live there.
I know a lot of (mostly younger) folks love the cosmopolitan, exciting feel of the place, but for me it's all just rush, rush, rush, completely impersonal, with people all around trying to fleece you or rip you off for whatever they can.
If you value time, relationships and space then I'd stay away. And, no, I'm not criticising ANY individuals that live there, but am generalising about the place (which is what this thread is surely about, eh ?).