Ok I fixed it. It's a project so it stay's in a mates shed.. I was freaking out yesterday as I had not had a chance to look at it and had just spent thousands on the car.
Turns out it was trivial.. When I first got to car it was cold and made no issue but after driving it for a while the noise started again so I jacked her up and started turning the tailshaft. Immediately I noticed the noise was from center bearing. It was like a rubber squeel/squeeky sound coming out of a brand new center bearing not even 50km old.. Sprayed a bit of wd40 in it and the noise is now gone. Inside the car it sounded much more forward to be the center bearing.. Anyhow I should probably slop a bit of grease around it next time I have it up.