Again incase anyone is interested !!!!!
Contacted Audi to order the water jet nozzle and cap and recieved this reply ....
See attached, Item 2 is no longer available to order, I’m not sure if item 1 actually comes with the jet attached, it can still be ordered, but isn’t available from England, so I couldn’t order and return if not suitable
The cap ( 2a) is available, £28.25 plus vat, and comes primed for painting. I would guess it comes on the hinged mount to attach to the bumper, judging by the price