Audi A6 2008 2.7 TDi Starts And Cuts Out

A6 2008 4F209H engine BPP Transmission KSY.

Strange this one so please see attachment and look at the contents...
Starts after a few seconds and then cuts out (not immo problem).
When it starts and runs OK for a few seconds then runs rough and cuts out.

Following tests carried out.
Only faults in scan was MAF and glow plug No3, MAF is ok and tried disconnecting, made no difference.
Suspected missfuelling, took a sample and is OK, even tried lighting the sample with a flame to see if it burns easy (possible petrol in it) won't light with a flame. So I think I can rule that out.
Removed leak off pipes and checked for injector sticking open (procedure from Elsa) all OK.
Did leak off test and all OK.
Checked fuel pressure with scope, this is were it gets interesting.
When it cuts out the live data is still showing 336 Bar (see attachments) then when I turn ignition off it goes to zero.

I have never come across an issue like this showing 336 Bar when engine is off!!
On Monday I will try another fuel pressure sensor but feel it will be the same.
Anyone had an issue with this before?

CR06MET_non start.rar
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