Right just to wrap this up i got to the bottom of the squeek today, i jacked the rear end up and stripped the rear beam down bit by bit and greased it, cleaned it re-tourqed all the bolts. I undid the lower control arm outer bolt and removed the spring, the lower control arm then pivoted down on the other bolt and as it did it went with the same squeek i had been hearing. Turns out that when i went and got the car 3D laser aligned the lad who set the rear camber ecentric bolts only did them up lightly when they needed to be 115NM, so the control arm on both sides had worked loose and this allowed foward and backward movement on the bush outer sleeve!!! Caught it just in time, car is quiet as a mouse again now thank god, i knew it was nothing i had done.