Given wage inflation over 40 years her salary would not be the same. Given asset inflation I'd expect the house to go up say 4x. Prices in London have been frothy recently, but as someone in a similar situation it is possible to buy in a nice area if you compromise on some things first time - either garden house/flat, or area. If you are in the top 10-20% (as many posting here are) there are lots of options in London for a good quality of life. Personally I would rent right now, save and await a correction.