Wow. It's around a year since the Insignia needed new tyres on the front. This time it's the rears that needed replacing.
They have been on since I bought the car and in my care have done around 30000 miles.
I searched the net again and Asda came out cheapest as before. This time I opted for Goodyear Eagle F1 Asymmetric 3 100Y in the size 245/45R18.
At £253 fitted I had the guy put the fronts on the back and the new ones on the front.
Immediately the drive and feel is totally different. More confidence inspiring.