The interest rates have only gone up in the past couple of months - of course there's no mass repossessions.
Many are still fixed on the old rate, and have up to 4 years before they pay more.
You have to default for a few months before the banks get really arsey.
There will be options for extending the payment period or going IO
And then if you still can't pay it'll take a good year before they get a court order/bailiffs/eviction
The problem is going to be when prices go down, recent buyers go into negative equity with no price increase in the foreseeable future, and they're paying every penny on a IO mortgage. Many will give up paying for such a massive never ending debt.