BBC Home Service

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 onwards. Radio 4 replaced the Home Service on 30 September 1967, when the BBC renamed many of its domestic radio stations,[2] in response to the challenge of offshore radio. It moved to long wave in 1978, taking over the 200 kHz frequency previously held by Radio 2, and later moved to 198 kHz as a result of international agreements aimed at avoiding interference.

Between 17 January 1991 and 2 March 1991, the FM broadcasts were replaced by a continuous news service devoted to the Gulf War, nicknamed "Scud FM".

Radio 4 is part of the Royal Navy's system of Last Resort Letters. In the event of a suspected catastrophic attack on the United Kingdom, submarine commanders check for a broadcast signal from Radio 4 to verify annihilation of the homeland

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