Whilst doing a bit of routine maintenance on the car today, I happened to notice a 8mm set screw wedged in the pulley for the power steering pump. On checking, found the bolt had come undone from behind the pulley and fortunately didn't cause any damage. I have now re-torqued all three bolts with a touch of locking paste.

I would advise all owners to check the torque on these bolts with the possibility of power steering failure!!!