Thanks for your reply Stephen, I think I’ve sorted it I had to have the back wheel in a position I wasn’t happy with to get it to run straight but I’ve run it up with the car in gear and the back wheel off the ground and it seems to have settled down don’t quite know why, and I’ve managed to get it running in a position I’m happy with.
Still moves to the out side of the front pulley in reverse but fine going forward but this is not uncommon I think.