Identify this noise please

[Zave]

Only happens on cold start and would like to get it fixed. 67 plate, 65k miles and still in warranty

VW T6 belts?

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[T6ARF]

Only happens on cold start and would like to get it fixed. 67 plate, 65k miles and still in warranty

VW T6 belts?

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Pretty sure that’s the auxiliary belt.... very common problem when it’s cold/damp?

 

[DXX]

IMO it’s the frequency of a revolution of a belt not the revolution of a idler / tensioner pulley.
I’d check the belts for damage over the entire length, start with the aux belt and if nothing found check the cam belt.