This is what the Gov uses for a couple of things regarding planning and affordable housing:That’s the mean average salary though isn’t it? Tends to be the median that is more used for things like this.
House price to workplace-based earnings ratio - Office for National Statistics
Affordability ratios calculated by dividing house prices by gross annual workplace-based earnings. Based on the median and lower quartiles of both house prices and earnings in England and Wales.
www.ons.gov.uk
I don't know why they use Workplace Based instead of Residence based (which they also produce) when looking at "local pressures".
House prices more than doubled when compared to household income in 25 years, however Manchester almost trebled 2.3 : 1 to 6.75 : 1 from 1997 to 2022.