Am about to buy a car from a guy who is 100 miles away. He works, which is relevant in terms of his daytime availability. And the car is on a private plate he wishes to keep.

As I undestand it, he needs to put the plate on retention and get a new V50 before he can sign the latter and hand it over to me. For my part I need to arrange insurance and register ownership and then tax the car all within an hour or two before driving the car home. Can this be done on line? Can you instantly re-register yourself as keeper?

What is the procedure?