ATS, in looking for a slow puncture, identified a tyre problem where the inner tread blocks are not smooth around the tyre periphery, caused by the edges of adjacent blocks not being of the same height. All four tyres are affected, but fronts and rears were swapped 3000 miles ago so the cause could be at either end. I am thinking of going to one of the alignment centres given on your website, or could the cause be something else? Vehicle: Jaguar X-type 2.2 Diesel Estate, June 2006, 63000 miles, dealer serviced, never crashed. Tyres: Michelin Primacy HP 225/45 17YR, all 4 fitted at 43000 miles.