1922–1939: Interwar period Between the early 1920s and the outbreak of
World War II, the
BBC developed two nationwide radio stations – the
National Programme and the
Regional Programme (which began broadcasting on 9 March 1930) – as well as a basic service from London that included programming originated in six regions. Although the programme items attracting the greatest number of listeners tended to appear on the National, they were each designed to appeal "across the board" to a single but variegated audience by offering at most times of the day a choice of programme type rather than simply catering to two distinct audiences.
1939–1940: Start of World War II On 1 September 1939, the BBC merged the two programmes into one national service from London. The reasons given included the need to prevent
enemy aircraft from using differentiated output from the Regional Programme's transmitters as
navigational beacons. To this end, the former regional transmitters were synchronised in chains on (initially) two frequencies, 668 (South) and 767 kHz (North), with an additional chain of low-powered transmitters (known as "Group H") on 1474 kHz appearing later. Under this arrangement, regional broadcasting in its pre-war form was no longer feasible, but much of the programming was gradually decentralised to the former regional studios because of the risks from
enemy attack or bombing in London to broadcasting nationally. This new station was named the
Home Service, which was also the internal designation at the BBC for domestic radio broadcasting (the organisation had also both the
Television and
Overseas Service departments). During the war, BBC Home Service would air each day from 7.00 am until 12.15 am, with main news bulletins airing at 7.00 am, 8.00 am, 1.00 pm, 6.00 pm, 9.00 pm and midnight. The Home Service continued in this form until the end of World War II.
1945–1967: Post-war era On 29 July 1945, the BBC resumed its previous regional structure. Following the wartime success of the
BBC Forces Programme and
BBC General Forces Programme,
light entertainment was transferred to the new
BBC Light Programme, whilst "serious" programming – news, drama and discussion – remained on the regionalised Home Service. Popular light programming such as ''
It's That Man Again remained on the Home Service, and some speech programming of the type pioneered by the Forces Programme – the newly launched Woman's Hour'' being very much in this mould – was on the Light Programme. Following the end of the war, the Home Service adjusted its broadcasting hours, now commencing at 6.25 am each weekday and 7.50 am on Sundays, and ending at around 11.10 pm each night. By 1964, the Home Service was on the air each day from 6.35 am (7.50 am on Sundays) and would conclude each night at the precise time of 11.48 pm. On 30 September 1967, the BBC split the
Light Programme into separate
pop music and entertainment stations, becoming
BBC Radio 1 and
BBC Radio 2 respectively. The
Third Programme became
BBC Radio 3, with the Music Programme losing its separate identities (the Third, Study Session and Sports Service were retained under the banner of Network Three until 4 April 1970), and the Home Service was replaced by
BBC Radio 4. ==Programming==