Took the car into eastern on wednesday - they're ordering up a new part as they say some sort of ball part is loose in the mirror. Fingers crossed the new mirror will fix the problem as it was doing my head in - weird that it's only at 2000 revs though. Really liking the diesel but haven't used my sport button yet - if that stiffens the car up it might make the mirror worse.
Will let you know how I get on.