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Can you pinpoint it to the cambelt cover/-auxiliary belts? maybe faulty idler or tensioner, and that belt seems to have more sideways movement than I'd expect.

No problems with cooling system? Water pumps are known for being a weak point, and can seize causing the belt to snap or strip it's teeth
 

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There is tipex on the belt cover - this is probably because it has been timed up without the correct locking tools. You can't do this on the V6 engine. Also your belt shouldn't move like that. I would start with a compression test & head gasket test to make sure the engine is OK, if it is then you need to do get the cam belt changed and make sure it is done properly with a TDC gauge and the correct camshaft locking tools.
 
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that either the timing belt tensioner is 'maxing out' or the water pump.

try disconnecting the AUX belt to see if the noise goes away.

either ways its timing to spend approx £450 on parts
 
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you could remove that long cover to get a better look at the tensioner & how its moving
 
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