I have done a search of the forums but havent found any relevant info to my possible problem.

I have a 53 plate A3 2.0 TDI 140, with 36k miles and full (long life) service history.

If the car is not used for more than 3 or 4 days, when I come to start it, it occasionally starts with a horrible stutter for a second or two, followed by a bit of white smoke.
This only happens when it has stood for a few days, when used daily, it appears to be fine.

I am new to diesels, I also only got the car in May so it is still under warranty. Is this a problem, and if so, is it something that will get worse in the cold weather?

There are no stored fault codes on the vehicle, I had it scanned a few weeks ago when the ESP light mysteriously sometimes stayed on after starting the vehicle (still uncured but hasnt happened for a while).

Thanks in advance.