Turned out to be high pressure fuel pump!!
Pressure tests on pump were fine with the vehicle standing, but on road test the fuel control soleniod was working to over 80%!! upon removal and inspection of HP pump i found the bolts for one of the piston caps were loose! thus allowing pressure to escape internally (sent to a diesel specialist for test/insp)which was only apparent when the vehicle was running(shaking)
Thanks again for all your input.
Richard.
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