How do you know they are worn? If you undo the drive shaft nut they will go loose. Test when drive shaft nut is done up tight (200mkg). If they are worn you need to check the hub itself and the hub can wear then you will be looking for a new/second hand hub
Thanks for these thoughts, the wheel and hub assemble is still in place, so no nuts undone yet and I have movement in the hub when I grab the wheel and put it under vertical and lateral pressure - so the wheel hub has to come off.