Average London salary: £44,000 Average London House: £531,000
There are many other UK-wide statistics pointing out to the jump in housing unaffordability (including rent) over the last 5 years.
Even if house prices is slightly more sane outside metropolitan, one needs to factor in how difficult it is to find jobs outside metropolitan areas, so the quantity of jobs outside expensive metropolitan areas need to be factored in, not just the average salary.
London is wild - I was lucky to buy a flat (£142k) when I was still young (2006) - which would have been 4.7 time my salary (though I bought with my wife). Even then, and with two good salaries, staying on in London with 2 kids wasn't really an option for us.
And as you say, this is replicated up and down the country in other major cities - people are just priced out or trapped in renting. No idea what my kids will do.
Regional variations will make this far worse in many popular and coastal towns - but the average is 8.25 times in 2024.