I've done all that I can with the suggestions from Vox and others.
As Vox thought the rack was stuck, the delivery valves stuck and the pistons not rotating or moving up and down. After freeing the delivery valves and cleaning the pistons they now rotate when the rack is in the start position and go up and down as required when the IP cam is rotated.
With no fuel lines on from the IP to injectors I've bleed the system with the hand pump and rotated engine while hand pumping (rack in start position) and still can get no fuel out of the IP.
To me everything looks like it should pump fuel. I have to be missing something?