When I got mine I was told it was roughly one month from confirmed build week to dealer door.
When you're at a dealer close to the UK port of ingress, you'll generally get them a lot quicker. I live about 2 miles from Port of Tyne and the local Pulman/Lookers dealers get their cars from the Port in 3-5 days.
Grimsby Audi told me they get the same timeframes from Port to dealership so hopefully a week or 2 shaved off for me (for those that have been following my S3 purchase, no longer buying from Belfast, I'm getting one from Grimsby, too much red tape faff from NI to GB.