It was the little violet wiring going from the engine control relay to the ecu had broken inside,
Had to take everything apart again to find it but got there in the end!!!
Also treated it to a nice new shiney yellow relay :D
Message Thread 
Vauxhall Vivaro 1.9 DTi F9Q 2003 - Intermittent cutting out when driving - Fixed # - Dean Gammon February 18, 2012, 2:10 pm
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