5
Yes, the black Warmenau wheels are indeed the bottleneck for production. I've been following the Germany forum, and from approx. page 100 onwards you can see many Germany and other EU customers have had delays due to the Black Warmenau wheels. It's a rather strange bottleneck because it's the default option on the PP car, and on the Black Edition Golf R so you would believe they have sufficient stock. In any case, I ordered with the sliver Warmenau wheels and had it double checked with the dealer - I didn't want the car to come with Black Warmenau wheels by mistake.
I only really considered about lots of stone chips, which would be evidence on a green car. Still debating it, it's a lot of money. It'll either PPF the whole car, or no PPF rather than having parts done so it won't be visible.
Congrats Garwen! You're probably part of the very first UK customers getting the car!