Zurich will insure a UK car.
I asked a broker recommended to me by HR.

They insured my UK car while I moved us and for a month or 3 over here.
You know, the Ikea runs to stock up of furniture etc

I felt it was better to have insurance with a green card from my Swiss address.
Greencards are expensive in the UK, and I no longer had a UK address which would invalidate insurance there...