Used F1 for a number of years without any issues. Had a front tyre fitted in late 2018 and the car pulled to that side. Had wheel alignment checked at another garage i use and the steering was still pulling. Swapped the front tyres across the axle and the pull now on the other side, which would seem to indicate a problem with the tyre itself. Cut a long story short, I contacted their 'Careline' and got a call from the Regional Manager and quite frankly his attitude and unhelpfullness was quite shocking - you would think someone in that position would know how to talk to a customer ?? i'm now left with resolving the issue myself and will never use them agai,