I honestly think If I'd had good tyres on my Zed (I purchased new tyres on this very night) then I wouldn't of had the accident that I had. Granted I hit a patch of the Icy stuff but I think following the loss of grip a set of good tyres would of put me straight quicker instead of continuing the slide.
I will never take the risk again, the only time I will drive one of my cars on with Cheap tyres is to the garage to have new tyres fitted.
I dread to think what my renewal price is going to be next year with a write off on it.