Where are people spending their money if 150k is hard to live on?
I don't know many people on £150k, but looking at £100k;
Two people earning £50k each will take home £72.6k.
Assuming a 25% deposit on a £400k house with a mortgage of £300k at 4% will be £19k.
One child in childcare full time, where I live is £15k. After school club is £4k.
A rough guess at council tax, insurance and heating say approximately £4k.
Two zone 1 to 6 travel cards are £4.6k
Running a car, say £4k
That leaves £22k, to spend on food, clothes, repairs, holidays.
You'd be comfortable, but not wealthy. And I would struggle to find a 3 bed house where I live for under £500k.