Update. Output shaft was shimmed and got rid of the noise. Perfect, until , Jonathan noticed the movement in the gearbox. So gearbox out. Found out that bolts had come loose and drive plate knackered. Had to hoist the engine of its mountings because of the stupid way it was fitted. Captive bolts sticking up through the mounting timbers so we couldn’t slide the rear engine mount forward which meant exhaust off and a load of other stuff witch was a right mare. Hopefully drive plate will arrive tomorrow and I can put it all back together.