Hmm. After a bit of "spirited" driving, managing to use full throttle and some not so smooth roads, causing the rear suspension to pretty much fully compress, I noticed, accompanied by a not so good noise, that the outer edge of the rear tyres on the XKR catch on the outer edge of the wheel arches, or more specifically, on the wheel arch extensions. It's marking the outer edge of the brand new MP4S 295/30R20 tyres I just had fitted. It has staggered Vulcan wheels and the old tyres (Pirellis) were the same size, but I didn't manage any "spirited" driving since owing the car, until today. Suggestions?