CDTi Non Starting problem
 

Sorry to hear you have that problem. My friend has still not got to the bottom of it. He has checked all the points that Jules recommends. I did suggest swapping the camshaft sensor with a known working item and that made no difference. His car has been laid up for 6 months but regularly kept charged. The one point I suspect is that the engine immobilisation is playing up. My CDTi tourer occasionally refuses to start - turns over okay - so I then operate the arm disarm sequence and it then starts! They do play up sometimes. Cannot offer any other suggestion other than Jules has suggested - getting the AA out?

The AA might just have heard the fuel pump running and assumed all ok.
Without measuring the pressure you cannot assume this.

If it was below 220kpa it would have difficulty starting.
LP Pressure should be at least 350 kpa for 2 pump system and over 400kpa on later single pump.