Regulation 3
Save as the Commissioners may allow, the vehicle or aircraft while in the United Kingdom—
shall not be (or be offered to be) lent, sold, pledged, hired, given away, exchanged or otherwise disposed of, and shall not be used for the purpose of picking up passengers or goods at any place within the United Kingdom for conveyance to another place within the United Kingdom,
shall be operated and used only by or on behalf of the owner or operator of the vehicle or aircraft or other person in charge thereof at the time of its importation or by other persons whose principal place of business is outside the United Kingdom who are expressly authorised in writing by the owner or operator of the vehicle or aircraft to operate and use the vehicle or aircraft,
shall not be operated or used by, or in the service of, any other person and in particular any person whose principal place of business is in the United Kingdom.