if it helps, I hit a kerb. Everything was fine, but I felt compelled to get 4 wheel alignment done - so I did!

Had nothing but trouble after that - car wanting to go right, and needing to hold wheel slightly left to keep in straight line. Had it checked twice again, and by a different garage. They suggested one of the front tyres was at fault. As it happens, the first time I had the alignment done, the tyres were rotated front to rear.

When I put tyres back in their original positions (that is, the front tyres to the rear and vice versa) everything was fine!!!

I may have clipped the offending tyre on a kerb, which caused (non-visible) damage, which only became apparent when on the front of the car.

So now I know I have a tyre at the back which is defective, even though it looks fine, and I can't 'feel'.

So, 2 more new Michelin Pilots on the back to match the new fronts!!