Having a browse on ALFA the other day i noticed they have placed a Bexit terms and conditions clause:
Motability Terms & Conditions:
Vehicles only available through Motability accredited participating Alfa Romeo Retailers and are not available in conjunction with any other offer. Terms & Conditions apply. Offer may be varied and withdrawn at any time. Subject to stock availability. These offers are valid for orders placed from 1st July to 30th September. Offers subject to change in the event of the imposition of any Brexit related tariffs.
So seems that even the manurfacturers are unsure