the other way is the easiest talk to the dealer and confirm they will make plates free as part of purchase, let them register the car normally. Drive home in the car, next day ring up motability and ask them do they have the digital copy of the V5 yet (they normally have this within 24 hours of you driving away) then you do it over the phone simple as. When lease is near the end you phone them again and take plate off, you then still have original reg to put back on the car and plates still in storage from when you purchased it 🙂