Ask HN: How much pay do I need in London?

I'm looking at moving to London, I've got about 5 yoe doing webdev, and I'm seeing a lot of jobs in the £60-70K range, it's lower than I expected. Is that enough to live a good life in London?

I feel like I'd be sharing a house, tolerating a long commute, or not saving much on that sort of salary. I think I'd make better career progress in London, but I'm not sure it's worth it.