Thanks for your replies, Got to the bottom of it today, turned out to be a faulty/ poorly assembled new injector wiring loom. One of the pins was pushing back as the connection made, wasn't able to see it until pin out check done at the ECU and cam cover removed.
You buy genuine for a reason but still we get kicked in the!!!!!!
Lot of wasted time!
Message Thread 
Vw Transporter T5 2005 - Non start, codes 18072 P1664 PD injector control circuit - Fixed # - Damian Daize April 25, 2020, 5:32 pm
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