Suggestions needed [peugeot 307 cuts out]

Hi all
I have a 2003 peugeot 307 1.4hdi with 201k on the clock.
I never had a major issue with it, drives well and still returns 55mpg.
Lately however I have been having an annoying issue, when I stop at a junction it displays symptoms like fuel starvation. It might happen only one in five times but generally at an awkward time ie when the lights turn green and you have a line of traffic behind:mad:. I can come to a stop at a junction, into neutral and foot off the accelerator revs steady at 1800rpm and without warning it starts to hunt, I try gently teasing it with the accelerator but no good it will cut out. It can stagger on for 20 seconds like this before stopping. It starts immediately on the key and everything is fine till the next time. Fuel filter replaced about 8k miles ago, pulls smoothly, smooth gear change. Mechanic cant fit me in til Monday week, in the meantime is there anything I can try or think about.
Any suggestions gratefully appreciated