Caveating to say just a few googled questions, so may not be 100%! Inspired by another thread.
Average cost England £245-260k
Average cost excluding M25 £180-£235k
Average cost within M25 excluding zones 1-2 £550-600k
Average cost England excluding zones 1-2 £250-270k
Average cost zone 1 - £2.9m
Average cost zone 2 - £1.5m
As proportion of take home pay mortgage spend is
England average - 19-32%
England average excluding zones 1-2 20%
M25 excluding zones 1-2 35-45%