August – The BBC Monitoring service is established at Wood Norton Hall in Worcestershire, acquired earlier in the year as a standby location in case of the need to evacuate facilities from London.
September
1 September – At 18.55 local time BBC engineers receive the order to begin closing down all transmitters in preparation for wartime broadcasting: this marks the end of the National and Regional Programmes of the BBC. At 20.15 the BBC's Home Service begins transmission: this will be the corporation's only domestic radio channel for the first four months of World War II (BBC Television has been shut down until 1946). There will be a daily Welsh language bulletin of world news at 5 pm.[1] Programming is initially limited to news, announcements, gramophone records and live music played by a limited pool of staff musicians, with extensive use of cinema organist Sandy MacPherson.[2]
Yorkshire-born novelist and playwright J. B. Priestley reads the first installment of his novel Let the People Sing, a celebration of local democracy specially written for radio, on the Home Service.[4]
6 September – William Joyce makes his first broadcast for German radio, reading the news in English.[5]
18 September – English-language propaganda radio programme Germany Calling is first broadcast to the United Kingdom on medium wave nominally from Reichssender Hamburg station Bremen (via the coastal Norddeich radio station). In today's Daily Express, pseudonymous radio critic Jonah Barrington nicknames the station's English-speaking broadcaster "Lord Haw-Haw". He is probably referring to German playboy journalist Wolf Mittler, who makes a few such broadcasts, but the name transfers to cashiered British Army officer Norman Baillie-Stewart (dismissed in December) and then to American-born Irish-raised William Joyce, with whom it is most associated. Baillie-Stewart and Joyce hold U.K. passports at this time, rendering themselves liable to prosecution for treason.[5]
19 September – Popular radio comedy show It's That Man Again with Tommy Handley is first broadcast on the BBC Home service, following trial broadcasts from 12 July.[6][7] Known as "ITMA", and also featuring Jack Train and many others, it runs until Handley’s death in 1949;[8] the performers have initially been evacuated to Bristol.