Hi mate. I've got an 04 plate 2.0 TDCI. 2 year ago I had the problem of the Glow Plug light flashing and then the engine dying a minute later. Took it to local Diesel Specialist and they put it on their Delphi Rig. To cut a long story short, I had the Fuel System replaced (£1600!). It was fine for 18 months and then Lo and behold, the same thing started to happen again. My car has always been regularly serviced (including Fuel Filter, change!!)
Diesel specialist reckons it is possibly Inlet Metering valve which is an ancilliary of the Fuel Pump or Injector #4. I have always had Fords, but this has really put me off Ford Diesels. Looking at the web, I am far from being alone in having these issues. Friends have had similar issues, and have spent a fortune going to local garages who do not have the equipment to test the system fully and as has been said, all you sometimes get on a code reader is Fuel Pressure Low/High, which could be anything in a Common Rail injector system. Good Luck.