Random bad idle

Hi all
I am having a random issue with my newer pre-facelift Micra SLX, a dream to drive, all running ok, apart from this issue.
It only has 45k on the clock from new, all been excellently looked after!
However, all of a sudden I get a random bad idle sitting at lights, (I have a stock rev counter on it), it dives down to 500 rpm, like it's going to cut out, sometimes it does cut out, sometimes it holds the 500. The acceleration /pull away seems a bit laboured when in this mode, then the idle randomly reverts to say normal 900/1000 rpm.
Anyone have an idea what this could be?
 
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