Median house price in France is €160,000 and in the UK it’s £297,000 ~ €350,000

Median salary in France is €23,280 and in the UK it’s £37,400 ~ €43,000

A house in France costs, on average, 6.87 times the average annual salary and in the UK it costs 8.14 times.

Caveat: all these numbers come from 2 minutes of googling figures so I do not vouch for their accuracy. This also doesn’t take into account the rental market or the availability of social housing just owner-occupier purchase price.