>>1237509There is another service, Ulsterbus Tours, which are associated with National Express and Scottish Citylink (Ulsterbus Tours owns a number of their own NI registered buses in National Express and Scottish Citylink liveries as well).
These are the services which leave Belfast and connect Belfast with Glasgow, Edinburgh, Birmingham and London. They are outside of Translink's normal fare system and most tickets for Ulsterbus Tours are actually sold by National Express instead. Yes, these coaches do go onto ferries, though sometimes, Ulsterbus Tours just drops passengers off at a ferry terminal, and another Ulsterbus liveried coach will pick them up at the other end.