(a) As Stevie stated you should be taxed exempt.
(b) RAC Mobility breakdown cover.
(c) 3 year warranty cover there are some good one around.
(d) I would recommend getting some insure quotes good quality insurance companies.
Your mileage is extremely low, far to low to financially justify a Motability vehicle.
Unfortunately I have suffered a brain injury and occasionally I get confused and often say the wrong thing.