| 1920 15 June Experimental broadcast made by Marconi's Wireless Telegraph Company Ltd in Writtle, near Chelmsford 23 November Further experimental broadcasts banned for defence reasons
1922 14 January Marconi begins transmissions of Britain's first radio station, 2MT, from Writtle 11 May 2LO, Marconi's London station, begins transmissions 16 May The Metropolitan Vickers Company begins experimental broadcasts from Manchester station 2ZY 18 October British Broadcasting Company Ltd founded 14 November The BBC begins broadcasting on 2LO 15 November The BBC begins broadcasting from 5IT Birmingham and 2ZY Manchester 14 December JCW Reith appointed General Manager of the BBC 23 December First daily news bulletin 24 December 5NO begins broadcasts from Newcastle-upon-Tyne
1923 8 January First outside broadcast (from Covent Garden) 17 January 2MT closes 13 February 5WA begins broadcasts from Cardiff 6 March 5SC begins broadcasts from Glasgow 26 March First weather forecast 1 May The BBC opens its studios at Savoy Hill 28 September First issue of Radio Times published 10 October 2BD begins broadcasts from Aberdeen 17 October 6BM begins broadcasts from Bournemouth 16 November The first relay station, 6FL, begins broadcasts to Sheffield
1924 Opening of relay stations 5PY Plymouth (28 Mar), 2EH Edinburgh (1 May), 6LV Liverpool (11 Jun), 2LS Leeds, 2LS Bradford (8 Jul), 6KH Hull (15 Aug), 5NG Nottingham (16 Sep), 2DE Dundee (9 Nov), 6ST Stoke-on-Trent (21 Nov), 5SX Swansea (12 Dec) 5 February First airing of the Greenwich Time Signal (the 'pips') 4 April First national schools broadcast 9 June Experimental broadcasts by 5XX on 1600m long wave from Chelmsford 14 September 2BE begins broadcasts from Belfast
1925 27 July 5XX long wave station moved to Daventry, radiating 2LO's programming on 1600m
1926 31 December British Broadcasting Company Ltd dissolved
1927 1 January British Broadcasting Corporation established by Royal Charter 21 August 5GB Daventry Experimental high power station opens on 610kHz. Birmingham and Nottingham stations to close
1929 30 September First daily picture-only television broadcast on the 30 line Baird system, at 11.00am via the 2LO medium wave transmitter 29 October Opening of the Brookman's Park transmitter in Hertfordshire, radiating 2LO to the South East and East Anglia on medium wave
1930 9 March Opening of the National Programme on long wave from Daventry (replacing 5XX) and medium wave from Brookman's Park. 2LO replaced by the London ('basic') Regional Programme from Brookman's Park, and 5GB by the Midlands Regional Programme from Daventry
1931 17 May North Regional Programme opened from Moorside Edge. The Manchester station (2ZY) and the Sheffield, Liverpool, Leeds, Bradford, Hull and Stoke relays are closed. The National Programme opens at Moorside Edge on 12 Jul
1932 1 May Broadcasting House becomes the BBC's headquarters 12 June Scottish Regional Programme opened from Westerglen. The Glasgow station (5SC) and the Edinburgh and Dundee relays are closed. The National Programme opens at Moorside Edge on 25 Sep 19 December BBC Empire Service launched (later BBC World Service)
1933 28 May West Regional Programme opened from Washford. The Cardiff station (5WA) and Swansea relay are closed. The National Programme opens at Washford on 17 Jul 4 June Radio Luxembourg launched, broadcasting 5.00pm-midnight, Sundays only
1934 7 October The National Programme moves from Daventry to Droitwich on 200kHz long wave. The Midlands Regional moves on 17 Feb 1935
1935 11 September Final 30 line Baird experimental transmission
 1936
20 May Northern Ireland Regional Programme opened from Lisnagarvey. The Belfast station (2BE) closes 26 August Experimental high-definition television transmissions from the Radiolympia
exhibition until 5 September 2 November Inauguration at 3.00pm of the BBC Television Service, the world's first regular, high-definition public television service from Alexandra Palace (Baird 240 line and Marconi-EMi 405 line systems on alternate weeks)
1937 1 February West Regional Programme becomes the West and Wales Regional Programme, with the addition of a transmitter at Penmon 4 February BBC Television drops the Baird system 12 May George VI's coronation televised 4 July Separate Wales and West Regional Programmes introduced. Washford radiates both services, Penmon the Welsh service. The National Programme no longer radiated from Washford
1938 3 April First television broadcasts on a Sunday, for one hour
1939 1 September BBC Television Service closed down at 12.10pm. BBC Home Service replaces the National and Regional Programmes at 8.15pm on 668kHz and 767kHz. The long wave service from Droitwich is closed Late 1939 The Droitwich transmitter is modified to radiate the European Programme on medium wave | 
