@Tgreen.
I appreciate you think you are correct but you are not.
We are customers of Motobility and when we decide which car we want to have, we visit a dealer and give them our personal details including NI number. They input these details via their gateway to the Motability system and, if your eligibility is confirmed, Motobility place an order with the dealer for the car. The dealer then raises an internal sales order reserving that car. They may ask you for a deposit, at their discretion, and you can choose to pay it or not.
At no time do you sign a legal sales contract for the car as the agreement is between Motobility and the company, you never own the vehicle and you do not start paying until after you input the pin upon collection.
As someone who has previous experience with leasing/contract hire and also been the recipient of a number of Motobility cars, I’m very aware of the process.