This debate seems to be missing a big piece of the puzzle.
30 years ago a skilled man (CNC Operative or similar) could earn £15k. This was considered a good wage capable of fully supporting himself, kids and SAHM wife. With overtime luxuries were possible, annual holidays, many contributed to additional voluntary pension contributions, share save schemes, etc.
Now "A CNC operator's salary in the UK varies by experience, but entry-level positions average around £20,000 to £25,000 annually, while experienced operators can earn between £35,000 and £42,000 or more. Factors like skills,"
Even with both parents working times are tough.
Wages doesn't seem to be the main factor more increasing COL. Cheap imports. Closing UK businesses. Tax loopholes for overseas businesses operating in the UK.