Greenwich Mean Time subsection 23(3), the same rule applies to deeds and other instruments. During the experiment of 1968-1971, when the British Isles did not revert to Greenwich Mean Time during the winter, the all-year British Summer Time was called British Standard Time (BST). In the UK, UTC+0 is disseminated to the general public in winter and UTC+1 in summer. BBC radio stations broadcast the "six pips" of the Greenwich Time Signal. It is named from its original generation at the Royal Greenwich Observatory, is aligned to Coordinated Universal Time, and called either Greenwich Mean Time or British Summer Time as appropriate for
BBC Radio Foyle Radio nan Gàidheal in Scotland and by BBC Radio Cymru in Wales). It was not initially available on DAB digital radio, however; the Northern Ireland multiplex licence only requires carriage of Radio Ulster. In June 2010, the BBC announced a trial scheme under which Radio Foyle would be available on DAB as a part-time sidecar station to Radio Ulster, using a similar format as the part-time longwave-programming optouts of BBC Radio 4 on the BBC National DAB multiplex. During this trial, the bitrate of Radio Ulster would drop during Foyle's separate broadcast hours, with Foyle carried as a split audio