I'm a software engineer in London (3 years experience), I earn £45k + bonus (5-10%). That puts me around 85-90% percentile for earnings in the UK. Is that low?

I live in a 3 bedroom penthouse with my friends, 15 minute cycle to work. Under 40% of my net income on rent, about that with bills. Used to be significantly cheaper but we moved (very) upmarket. I guess a 1 bed would be a bit more expensive, but 1 beds tend to be mostly for couples. I save maybe 25-30% of my net income and spend the rest on social stuff and holidays.

I don't feel like I'm just surviving, I feel embarrassingly wealthy compared to my (non software) peers. Surviving on the average London salary would be a different matter.