Ordered April 25th - BW 43 (started as BW 37 and gradually slipped back) - Fresh order
This is a bit of a fruitless task as spec affects the BW so much!
I think it must be down to the dealer and your relationship with them and then the relationships they have within the Audi network
Same as Scotty2011; deposit in Dec 14,ordered 16th April; Currently BW39 (21st Sep). New order. Buildweek date has changed 7 times in all ranging as far forward as 29 to as far back as 42. It has stayed stable now for 5 weeks, and is only 6 weeks away now, so I suspect it will move to Code 20 anyday.
I'm quite sure mine has moved to code 20 as my BW was jumping back and forth all the time and now had an email from the dealer confirming a BW39 and hasn't shifted in about 4-5 weeks! How long before BW does it more to prep stage?!