Thanks for the advice everyone. I took it off tonight and it was well bunged up. Gave it a thorough clean with Gunk and WD40 and put it back together - job done in less than an hour and only one socket lost in the process (somewhere in a snow drift) - quite good for me !
Gave it a quick run up and down the main road and no flashing lights - yippee !
Think I'll treat it to a tin of BG244 anyway, but thankfully I think I may well have fixed it
Ok, I'll track some down - don't think Mr Halford sells it so will have to order some. Read that its pretty easy to take the valve off so I'l have a shufty and see how bunged up it is. Have to wait a day or two though - snowing pretty heavy now and no garage :-(
Tks - it was running pukka Ford software (or at least he said it was) - the guy revved the engine and monitored the EGR reading live - said it should close whent revved and was still showing 2-3mm, hence him thinking it was sticking.
I've googled the code and scared myself by the number of posts saying they changed this, that and the other and didn't pin down the exact reason - everything from a bunged up fuel filter to new injectors.
I'm going on holiday in two weeks time - it has to get me to Gatwick (130 miles) - think its safe to drive if I don't cane it ?