My engine is quiet when it's cold. When hot and idling there's a dull rattling noise from the top end somewhere that is cyclic. Quiet for a couple of seconds then rattles for a couple. At first I thought it was a loose heat shield or plastic trim somewhere. But when I opened the bonnet and listened, it seems to come from the top of the engine.

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I've read on a UK forum that it's the timing chain, and all the THP engines do it. Has anyone else experienced this, and has it caused any problems other than sounding bad ?

It's in for it's 1 year service soon so I'll ask about it.