It is a (temporary) available service that you use can get your car insured prior to pick up if you don’t yet know the reg number, once you do it’s then just a quick telephone call to your insurance company. Its also quite normal for imported cars that are not yet registered (have a foreign number plate) in the uk yet.It's not normal and the insurance cannot be registered to the database on a VIN. So the risk is your car will show on ANPR as uninsured.