8. Where a vehicle is so constructed that a semi-trailer may by partial superimposition be attached to it in such a manner as to cause a substantial part of the weight of the semi-trailer to be borne by the vehicle, the vehicle and the semi-trailer shall be taken, for the purposes of this Part of this Schedule to constitute a single vehicle.
9. The purposes prescribed by this Part of this Schedule as purposes for which the holder of a trade licence may use a vehicle on a public road by virtue of that licence—U.K.
(a)do not include the carrying of any person on the vehicle or any trailer drawn by it except a person carried in connection with such purposes; and
(b)are without prejudice to the provisions of subsections (4) to (6) of section 11 of the 1994 Act which specify the classes of vehicle which a trade licence is for, in the relation respectively to a motor trader who is a manufacturer of vehicles, any other motor trader and a vehicle tester.