Sorry for the late reply, looks like I got lucky and a change of gearbox oil etc sorted it, given the amount of metal powder in the oil we drained out I got very lucky and a replacment gearbox is on the cards soon.
My 2005 TD6 auto, i put it through a carwash and a mile down the road lost drive it felt like a slopping clutch as in engine revs had no effect.
I tried in D and R and in Manual mode also in Low range.
All had the same result.
after half an hour...