Overwhelmed with second homes / vacation homes are not sustainable. I guess my idea of a second home / cabin is much more upper Midwestern USA than what happens in the UK.

I agree there needs to be some kind of exponentially growing tax rate for multiple houses. It might kick in after two houses since a single shared vacation home between a family should be fairly affordable.

That being said its basically impossible to get a vacation home now. No one should have 3+ homes without paying much much more.