Drained the oil from the gearbox, I dont think I have ever seen auto trans fluid so black and burnt. Changed the screen and also the electrical connector seals. Refilled and test driven. Absolutely awful. They had been driving it in W setting which selects 2nd gear to pull away, when you select S as it sits in 1st gear it is shunting and does not pull away cleanly and as you drive you can hear the 'box switching rapidly between gears then the vibration appears.
New 'box time methinks?