After returning back from GTI spring festival yesterday, I noticed there was a strange rattling/grinding noise coming from the timing chain/belt. Its not a permanent noise, just every so often.

To me it sounds like a knackered bearing or something.

Any ideas on what it could be?

And how id go about fixing it, what I would need to buy.

Cheers in advance :)

most likely waterpump or alternator bearings.