Erm... I wish I could claim that credit but not really. In January I bought my '02 TD4 with the exact same problem, the previous owner had spent over £1,700 with two "specialists" trying to fix it with no success (new injectors, sensors, wiring etc.) The last "specialist" had told him that it was a random short in the wiring loom and hence needed a full new loom. I bought the car on a spares/repairs basis and after a weekend of reading LandyZone I picked up that any fault with the engine running on after being turned off (without oily smoke) is likely to be the fuel pressure reg. So one cold Saturday morning I removed it, cleaned it, couldn't find anything obviously wrong with it so put it back and the car has never missed a beat during the 7 months since.... Not sure whether it was a bad electric connection or a bit of dirt but just removing and re-fitting sorted it.