asked the Secretary of State for Transport what, if any, administrative problems would be involved if all caravan owners were required to license their caravans annually, in the same way as motor cars are required to be licensed annually.

Other things being equal, there would be two main administrative problems: (a) refunding vehicle excise duty for the lengthy periods which most caravans spend off the road each year; and (b) enforcing vehicle excise law bearing in mind that even when they are on the move caravans are nearly always parked off the road.