Turns but doesn’t start 2.0hdi

[runningman]

I’ve just read https://www.berlingoforum.com/thread-20483.html

Mine is similar.

Background.
The car / van was working, left it on the drive for few days, and now it doesn’t start.
It had a new battery in November as the old one was shot and since then had been starting well.
It has the “Siemens rough running feature” and can Chuck itself into limp mode with the following code p1351. This usually happens if you try to pull away with no throttle. 
Other than that it’s been fine and passed it’s mot last month.

It’s airbag lights x2 came on shortly after mot and the usual clean of contacts under seats doesn’t resolve.

Issue.
It turns well but doesn’t start. The following codes come up on my Bluetooth scanner u1003, p1351 and I can’t clear them.



I’ve removed the ecu connections and they look good and clean so put them back. I’ve owned the car since nearly new and unlike the post above no one to my knowledge has messed with it.

The mechanic I’ve used in the past kindly came to look and plugged in his box of tricks and got the following codes 0504 and 0A08 and 0440 and 0480.

Your help please...