It depends. If we are looking at a portion of someone’s income and trying to understand the impact of interest rates it is unlikely the average house will have an average income like was presented.Well, not really. It all rolls into one.
As house prices are so silly and now 10x the average salary, bigger mortgages need to be taken out for even the most humblest/average of homes. This means insterest rate rises hit massively more hard than they would before, and realistically, the BoE if already at the maximum of whet they can do without causing massive problems.