The van is now driving again. Fuel pump fixed.
The problems were:
The solenoid at the bottom of the pump was seized, after much persuasion, the part finally came out. And i replaced this part with a new one.
I then sent the driver of the pump (top electrical unit of the pump) for testing to ZIPART, ( www.vp44diesel.de
They tested the pump and found that the angled sensor in the pump was damaged.
So they fixed that. This was a fantastic service, Highly recommended. Cheap and efficient way of repairing the Bosch pumps that cause so much trouble!
We then got the pump returned and fitted into the vehicle.
Hopefully thats the end of my troubles for a long while
Thanks for everyones help with this matter!!