I figured it out, the Power Steering pump without the tensioner is from a 200tdi Range Rover. So I quess the who engine is from a RR, I thought it sounded a bit Snooty!
After a bit of research I found out that the RR 200tdi also has the high turbo.
Disco seems to be the same.
Any thoughts on which would be better? My thought is that this setup is better because it is simpler.