I am having some trouble with this s type.

The fuel pressure is staying high most of the time, but it is worst when it is cold [see attached file if it works]

http://www.mediafire.com/download/bpdsglhsn6499uq/Jaguar_S-Type_2006_Diesel_cold.psdata

The pressure control valve duty cycle is switching off trying to bring the pressure down.
So i throught it was sticking so i replaced it. While the pump was off i changed the volume control valve as well.

The fault stayed the same. The volume control valve duty cycle is over 30% when the fault is at its worst. I think the ecu is opening the volume valve to much and the pressure valve can't lower it enough.

Is there any inputs to the ecu that controls this?
Or anything inside the pump that might cause this?

The pressure into the pump is 1 bar.
The return pressure from the pump is 1 bar.

I have connected a very high pressure gauge onto a injector pipe to confirm the pressure sensor is reading right.

Sorry for the long post, Thanks for looking.
Ian