Hi, thanks for the speedy reply.
Firstly I'm pretty happy with the aux belt as last year a garage replaced my alternator but not the belt and two days later the belt snapped, flicked up behind the timing belt and trashed the engine. When I was refitting the belt I checked, rechecked and then checked the belt again. I even turned the engine over manually to check it was running smoot and all seems well.
When I filled the system up I had the wheels off the ground and was repeatedly turning the wheels from lock to lock and the juddering decreased but there is still this residual juddering which is still there.
I'm glad to hear that juddering is a sign of air in the system rather than, say, the rack being faulty. I suppose just a bit more driving and lock to locking and it may work out?
Currently in eep803's garage:
2005 Renault Trafic 100dCi