The Road Traffic Act 1988 (as amended) defines the requirements (and exceptions) for users of motor vehicles to be insured or secured against third-party risks.
Section 144 lists the exceptions, including
� a person who has deposited and keeps deposited with the Accountant General of the Supreme Court the sum of �500,000;
� a vehicle owned by a police authority;
� a vehicle owned by a health service body;
� a vehicle owned by the council of a county or county district in England and Wales, the Broads Authority, the Common Council of the City of London, the council of a London borough, a National Park authority, the Inner London Education Authority, the London Fire and Emergency Planning Authority;
etc.
at a time when the vehicle is being driven under the owner�s control.