I am preparing my 2017 Corsa 1.4 Turbo for its forthcoming MoT. I do not do many miles, no more than about 5000-6000 per year. The front offside tyre is low on tread and for sure needs replacing, the near side front has just under 4mm and I will also replace.

Since I do so few miles, I am looking at all season tyres so that I can get maximum grip and stopping ability throughout the year, but the websites I am looking at (national chains) are recommending to replace all 4 tyres when fitting all weather tyres. My rear tyres both have between 5 and 6mm tread. Is it really necessary to replace the rears also?