Marketing/Advertising campaign. From what I've read it seems that the bulk of the first deliveries will be out of Southampton (as everyone says it reduces their transport costs) whilst a smaller quantity will be sent to Aerospace Centre Bristol, Duxford Imperial War Museum, Rhosneigd and Loch Fyne. Two beautiful landscape settings and two Aerodrome settings, must be marketing, marketing and more marketing. Get ready to spot your number plates in future model Y advertising!
I've yet to see Tesla ever place an advertisement since it's inception, they don't even have a marketing department, internal or external. I'd say the lack of available drivers and car transporters etc. is more of a factor.