Me and DH are both Londonders, earn about 65k between us, 1 child, a 3 bed house in zone 3 and I feel very lucky. The ONLY way we could own a place was that I inherited some money in my 20s, bought a small cheap flat in Kennington, moved up, and eventually bought a house for under 350k. It's now worth closer to 600, four years later. Bonkers.
The area I grew up in is far, far nicer than where we live now. But houses there go for 2.5m upwards. And when I was growing up, people on my road had 'normal' jobs - teacher, dentist, photographer etc. Now it's all bankers and city workers.
I do get fucked off with articles about how you can't get a 2 bed flat in London for under 450k etc etc (Evening Standard, I'm thinking of you) and then you discover they mean west London, or Islington, or Stoke Newington. There are dozens of great neighbourhoods in the city, within zone 3, which are still (just) affordable.