although it drives fine its a little clunky sometimes on changes shall I top up or change gearbox oil;

 

More details, please, like how many miles on the car ? Early cars did suffer a lot from thus syndrome, (like mine did), and usually a TCU reflash and gearbox oil and filter cured most of it. However whatever you do, you'll never get rid of the hunting syndrome on gearbox warm-up.I had it when I bought the car in 2010, and it was still there when I part-exed it in 2016 for my present X358 which doesn't have it. Clearly something was done to cure it, but Jaguar and ZF continue to keep stumm