Just a quick bit of info on how motability works.
Its contract hire
You pay £195 per month no matter what car it is (unless its really cheap)
You pay an advance payment that does depend on the model (varies from £0 to >£10000)
You have to hand it back after 3 years.
You get nothing back for it no matter what options you paid for.
Reservations notwithstanding, its a great way to get a car especially if you can't work because of a disability.
Matt