Vibration noise

Hi all,

Some of you may have seen my other thread on the matter. My car has now been in to a local garage after being to a Volvo and Skoda dealership a number of times, and my local garage have said there is an issue with something like the rear diff or prop shaft or something related. The car has a sort of vibration noise at low revs when under load, almost as if the heat shield and/or exhaust mounts had an issue. When it went in to the garage today the mechanic started rocking the car by dropping/dipping the clutch quickly, and a knocking sound could be heard from the rear of the car as clear as day.

The car is booked in next week for deeper diagnostics, just thought I would a) post an update here, and b) see if anyone has anything to throw in to the mix?

Thanks,