I ordered 15th October at 4am for this spec in Glasgow. I have a VIN, but no delivery window.
I also ordered on 26th Jan (because so many in Jan got dates for Day 1 delivery events) for Black/Black/20 set as Southampton, got a VIN and a date range of 26th Feb - 12th March
The VINs for both of these came in at the very same time this week, the second order has a VIN that is 500 digits higher.
I suspect my Glasgow one doesn't have a date because I have a Trade-in (not sure they're rushing to take trade-ins), maybe they'll take the VIN away. Where as my Southampton order is Cash.
Others in Glasgow that got VINs and dates on the same day as me have a delivery window of 27th Feb - 13th March. So I am hoping I get a text soon to pick a delivery day, if it's in that window I'll keep it, but if it's a week or two later I will go and get the one in Southampton instead and cancel the Blue/Black/19. Almost definitely on SFL Composer based on when I got both of these VINs, which was when it left Singapore (refuelling?)