The Road Transport (Northern Ireland Passenger Services) Regulations 1980
These Regulations exempt vehicles authorised under the law of Northern Ireland for the carriage of passengers for reward in Northern Ireland, when used in Great Britain for the carriage of passengers on certain services between Northern Ireland and Great Britain, from the requirements of sections 127 and 144 of the Road Traffic Act 1960 (which lay down requirements as to the licensing of public service vehicles and their drivers) and section 4 of the Transport Act 1980 (which requires stage carriage service to be provided under a road service licence). In the case of vehicles used on regular and shuttle services as defined in Council Regulation No. 117/66 (Regulation 2) the vehicles must be used in Great Britain under an authorisation issued by the Minister of Transport (Regulation 4).