A quick google suggests this may be the problem with my Zafira SRI.
65k on clock and 55 plate. Banging on from engine bay when clutch is pressed and depressed. Thought intilally it was a belt as it only happened when cold but that was a red herring as when getting going I didn't drive with clutch in for a period of time.
Most noticeable when starting up with clutch pressed in.
Looking like about 700 to repair. I don't even know what one does.