Thanks for the reply Chris.
I decided to get a new one which will come tomorrow, £480 which isn't that much more than the cost of getting it rebuilt which was going to take three or four days plus I haven't really got the time to wait.
What a pain in the arse it was to remove though, the van has a transverse engine , you can get to the turbo from underneath but only at arms length which is the main problem . I could only use a spanner as there was no room for a socket, impossible to get any leverage on the spanner with my arm outstretched.
All the nuts were far too tight, I used a spanner and attached some strong cord up into the engine bay and got my brother to pull it with finally loosened the nuts.