Well I have a three pin fault code reader on it's way so will see if that comes up with anything.

Actual pressure we got off the pump (via popping a gauge between the fuel feed to the filter banjo) was 4.0 bar so we are not that far off there.

We took a reading from the return of the Fuel Reg and that came back as nothing (despite adjusting the screw) which leads us to think that the reg might of had it