Just clattered the kerb whilst out in the snow, basically have a 6 inch cogg like mark on the wheel which has gone through several layers, down to the bare alloy. Looking to use Wicked Wheels mobile service, anyone used them, any good?

I've used this company and can recommend them http://www.smartautorepairs.com/

Did exactly as you and they came and repaired it quickly, nicely and promptly for £65.