Jeez, what a kerfuffle over nothing.
There are 2 order forms, one from Motability.
Another is the factory order form from the dealership. I signed one to oder a factory vehicle, and on that order was the owner, Motability sale, and the price was the AP.
This order form is required to initiate the factory order. The vehicle was ordered by this form before my renewal window opened. Given the long wait times for factory orders, some dealers like to do it this way.
As for a deposit requested by the dealer, it must be done in writing and signed by the customer.
The deposit scheme must be ok with motability.