Thanks for the replys, sorry for the late response!
I only had this once so don't think it's a massive issue, HOWEVER. now that we have the cold weather I've found that the car is unhappy starting when bellow 1-2 degrees centigrade, I have to give about half gas (not ideal taking it up to 3,000 immediately on such a cold start) otherwise it stalls about 2 seconds later. I think this could be the sensor Phil mentioned, as the fule/air mixture wold be different for a cold start along with the temperature.
Its going for diagnostics on Saturday so hopefully not a experience job!! ... It maybe my excuse to upgrade the old girl!!