What is that receipt mentioned here? Any standard form which seller has to give to the buyer?
In the UK, all vehicle and driver licensing is done in Swansea by the often of poor reputation DVLA
When a person buys a secondhand car in the UK, they merely send a small part of the V5C in to 'DVLA Swansea' with their name and address on it. That's it. A new V5 then arrives at the new keeper's address. The keeper is not necessarily the owner, but usually is. An owner should really have a Bill of Sale somewhere to show if necessary but I can't ever recall anyone asking for one. From the moment a person buys a new car, they need to insure it in their own name. That means most buyers should return to collect the car after they have obtained insurance because the seller's insurance no longer covers the car once they sell it and title passes to the new buyer (as soon as the full money is paid to the seller). A seller with an insurance policy allowing any licenced driver to drive the car cannot reassure a buyer that all is OK, because officially the car is no longer his and the policy is void.
But apart from this insurance complication, buying is much easier in the UK and registering the car does not involve changing numberplates unless you want to do so for some reason. You just send in a form and insure the car in your name, job done. :)