You can tell who bought before the housing boom, or are we all middle class?
Typical figures for someone on £30k a year who bought in the last few years might be:
Take home pay after deductions + 10% pension contribution: ~£1700 /month
Mortgage of £150k /25 years @4%: ~£800 /month
After utilities, council tax, commuting, food bills they would have almost nothing left. Depressing!