Through experience in the years gone passed (many years using Motability), the dealer has to fulfill your order as it was placed prior to coming off the scheme. It is like the AP rising in a new quarters, they have to fulfill it at the time of order, not the aftermath. Hope that helps,
Current car 2019 Ford Kuga 1.5T Titanium X Edition (White)
On order new Vauxhall Grandland Ultimate 1.2 Turbo (Ruby Red)