55 section tyres

[Coupeboy]

Again nothing comes up on search. I have just noticed that my rear tyres have got 205/55/15 section tyres and the fronts are 205/50/15 (correct factory size). The MoT tester has never said anything and I assume the previous owner put them on as a cost saving measure - 50's are a tad more expensive. Does anybody know if fitting tyre sizes different from factory choices invalidates the insurance? Not that I want to but it would just bring forward a WInter project to put the correct sizes on. Anybody want some 205/55/15 Khumo Ecstas with decent amount of tread before I put them on ebay?

[Coupeboy]

Just checked my 55 section tyres and they are 'Champiros'. Guess they are going on e-bay then....