Have a look again at the Launch video. The silver and black ones also bear the number '3' (all at the same time !) So my guess is that it has nothing whatever to do with a real U.K. registration, and (if they are reading this) MMC will be pee'ing themselves laughing that we would think they would squander their resources that way.
Yep, hence the comment:
Originally Posted by TBM
.The '3' on the Super 3 will be for show purposes only and not permitted on the road.