Without conducting a test drive, it is difficult for me to speculate on the exact cause of the issue. It could potentially be related to various aspects such as tracking, suspension components, mounts, or other factors. However, I experienced a similar situation with my previous vehicle, an older model J-registered Wetro GTI. Surprisingly, the problem turned out to be the front tyres, which I only discovered when I had them replaced in order to pass the MOT inspection.