days a year, listeners have to rely on FM broadcasts or DAB for mainstream Radio 4 broadcasts – the number relying solely on long wave is now a small minority. The cricket broadcasts take precedence over on-the-hour news bulletins, but not the Shipping Forecast, carried since Radio 4's move to long wave in 1978 because long wave can be received clearly at sea. The station has a strong reputation for news, drama, and comedy. Following the Six O'Clock News from Monday to Friday, the station normally broadcasts a thirty-minute comedy programme. The station is available on FM in most of Great Britain, parts of Ireland and the north of France; LW throughout the UK and in parts of Northern Europe, and the Atlantic north of the Azores to about 20 degrees west; MW in some areas; DAB; Digital TV including Freeview, Freesat, Sky and Virgin Media, and on the Internet. Freesat, Sky and Virgin have a separate channel for Radio 4 LW output in mono, in addition to the FM output. The longwave signal is part of the Royal Navy's system of letters of last resort. In the event of a suspected catastrophic attack on Britain, submarine captains, in addition to other checks, check for a broadcast signal from Radio 4 on 198 longwave to verify the annihilation of organised society in Great Britain. History The BBC Home Service was the predecessor of Radio 4 and broadcast between 1939 and 1967. It had regional variations and was broadcast on medium wave with a network of VHF FM transmitters being added from 1955. Radio 4 replaced it on 30 September 1967, when the BBC restructured and renamed its domestic radio stations, in response to the challenge of offshore radio. It moved to long wave in November 1978, taking over the 200 kHz frequency (1,500 metres) previously held by Radio 2 - later moved to 198 kHz as a result of international agreements aimed at avoiding interference (all ITU Region 1 MW/LW broadcast frequencies are divisible by 9). At this point, Radio 4 became available across all of the UK for the first time and the station officially became known as Radio 4 UK, a title that remained until 29 September 1984. For a time during the 1970s Radio 4 carried regional news bulletins Monday to Saturday. These were broadcast twice at breakfast, at lunchtime and at 17:55. There were also programme