Angus
Same happened to me, I replaced both rear wheel bearing 2 years ago and the n/s failed at 65mph on the A5 near Betws y Coed last July.....heart stopping moment as the car tried to jump into the hedge As Rob says, a faulty batch, apparently. The bearing welded itself onto the drive shaft and I had to cut the bearing and carrier off. I shall replace the potentially faulty off side bearing this winter.
Malcolm