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 Ulster January 1975, replacing what had been an opt-out of BBC Radio 4 (previously the BBC Northern Ireland Home Service) and as a result of the BBC's widely regarded under-reporting of the UWC Strike in May 1974. An opt-out of the station exists in Derry BBC Radio Foyle, carrying alternative programming and news for much of the time between 7:30am and 5:00pm weekdays and a few hours at the weekend. The station is also broadcast on DAB Digital Radio, digital television and on the internet. During the station's downtime, BBC Radio Ulster simulcasts BBC Radio 5 Live programming (weekdays from 12:00am-6:30am,