only 20k? are you a lottery winner or something?
Are you a taxi driver or something? 😛
I believe in the winter tyres, I will be getting some in the future. I think the big difference is the compound is designed to work in temps less than 7degC, and come summer the compound doesn’t last as well or as well suited to the warmer temps. If this kind of weather is becoming a regular feature of the british winter, then we should have the same tyres rules as most of Europe does.
Check this if you still doubt their effectiveness.