@Geordie Lee Nah, don't worry, it's cool. Asked my dealer for the factory order print out which she gave me originally, but with dates on around shipping etc.. still waiting for that.
However, I did call Audi UK, who this time were more helpful, eve though it wasn't good news.
My car is indeed on 'order stop' in Emden, so it's not going anywhere soon. Pushed for more detail as to why - started throwing toys outa little bit - and the guy is going to call back with more info if he can.
Thought a bit about all this and found this on a German Audi forum:
"The delivery stop number 4701 means that there are problems with the coating of the rear brake pistons, which must be checked and replaced if necessary. This error can cause overheating and gas bubbles in the rear brake system, increasing the pedal travel and braking distance. Affects only the rear brake system. Audi is working on a solution. Problem is at the moment probably still that there are not enough spare parts. The stop of delivery concerns vehicles which were produced between April 14 and May 24, 2018 , already delivered vehicles are called back."
Mine was built just at the start of that period! So, I am assuming this is the hold up.
Obviously can't guarantee validity of this, but does tie up with a recall in the US.