Any summer tyre in temperatures below 7c degrees will become harder and loose grip capabilities on any surface. Recent climate changes should also be considered, in the past few decades climate been relatively mild and wet through out the year but in the last 8 years we witnessed heat waves in the summer plus cold freezing temperatures and snow in the winter, weather is getting more extreme so all season tyres are becoming more suitable for our region. In Canada many manufacturers sells their new cars with all season tyres as oem fitted, make sense right. I will never buy a UHP tyres and fit them to a Prius or similar car, those cars are “ cold” cars, it’s all about energy recovery, heat and fuel efficiency, so tyres are part of the whole “green and efficient “ process. These cars are designed for easy and relaxing driving, components like brakes and tyres barely gets hot unless mad style driving been done. For drivers doing 10k miles or less per annum All season tyres are the best option without doubt. I do 5 times more and I have separate summer and winter sets of tyres, economically and safer in my case. The problem with summer tyres in winter conditions is not because they are not as good, but they are simply DANGEROUS. If more people prepare themselves better for the cold days there will be less comical situations on the uk roads.