I can counteract your anecdotes with the fact not one of my circle (which includes surgeons, barristers, teachers, analysts) have got on the ladder without parental help be that in the form of deposit, guarantor or living at home to save
I believe you. But why is that?
My experience is that the more affordable areas of London that people on average London salaries COULD afford to live in, they don't want to live in. I live in Lewisham. That frequently gets spoken about on mumsnet like it's a ghetto in the seventh circle of hell. But this was where we could afford to buy, so we compromised.
Of my friends who don't own, a decent percentage of them don't own because they are renting in better areas they could afford to buy in and they don't want to move.
I'm sorry if that's not your experience, but it is mine.
The London housing market in most areas is an absolute joke, I agree.