Odd Rumbling when idle

Hi all, joined just to ask this question.

2009 Friday car (all sorts of niggly probs with it from the word go), now making a low rumbling revving sound when idling. Seems to do this more when warm than cold.

Noise stops if the fan and any other electrics are turned off (lights, radio, etc). No loss of power, just what sounds like a gentle rev, although the rev counter doesn't move and there's no change in engine speed. Anyone had this before or know what it might be?

Also, if anyone has any tips on how to fix the rear seat release on a 3dr version, I'd be grateful because it's a fight to get the seat released to lay large stuff in the boot.

Thanks in advance
 
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