- WARD LESTER DISPLAY COMPANY LIMITEDType: Advertising agenciesIncorporated: 30 August 1967
- LEO BURNETT LIMITEDType: Advertising agenciesIncorporated: 17 April 1967
- RNIB ENTERPRISES LIMITEDType: Media representationIncorporated: 6 September 1966
- ASSOCIATED GLOBAL MARKET RESEARCH LTD.Type: Market research and pollingIncorporated: 21 March 1966
- FINANCIAL TIMES (FRANCE) LIMITED(THE)Type: Media representationIncorporated: 22 December 1965
- I.F.F RESEARCH LIMITEDType: Market research and pollingIncorporated: 25 May 1965
- MEDIABRANDS LIMITEDType: Advertising agenciesIncorporated: 13 September 1963
- SCREEN ADVERTISING WORLD ASSOCIATION LIMITEDType: Media representationIncorporated: 11 February 1963
- MCCANN-ERICKSON HEALTHCARE UK LIMITEDType: Advertising agenciesIncorporated: 22 March 1961
- MULLENLOWE LONDON LIMITEDType: Advertising agenciesIncorporated: 16 January 1961
- SAATCHI & SAATCHI (CENTRAL SERVICES) LIMITEDType: Advertising agenciesIncorporated: 5 September 1960
- PEARL & DEAN CINEMAS LIMITEDType: Advertising agenciesIncorporated: 31 October 1958
- S.H.BENSON(INDIA)LIMITEDType: Advertising agenciesIncorporated: 1 January 1958
- GREY ADVERTISING LIMITEDType: Advertising agenciesIncorporated: 30 October 1954
- CINEMA ADVERTISING ASSOCIATION LIMITED(THE)Type: Media representationIncorporated: 15 January 1953
- WPP BRANDS (UK) LIMITEDType: Advertising agenciesIncorporated: 2 November 1944
- KANTAR DORMANT 3 LIMITEDType: Market research and pollingIncorporated: 23 October 1944
- INCORPORATE DESIGN LIMITEDType: PR and communicationsIncorporated: 4 July 1942
- BAUER MEDIA OUTDOOR INTERNATIONAL LIMITEDType: Advertising agenciesIncorporated: 6 January 1936
- RICHMOND TOWERS LIMITEDType: Advertising agenciesIncorporated: 1 July 1935
- PRODIGIOUS UK LIMITEDType: Advertising agenciesIncorporated: 14 November 1934
- FIFTY5BLUE UK LTD.Type: Advertising agenciesIncorporated: 25 April 1933
- APL GROUP LIMITEDType: Advertising agenciesIncorporated: 19 December 1928
- SAATCHI & SAATCHI GROUP LTDType: Advertising agenciesIncorporated: 7 July 1928
- OGILVY & MATHER GROUP (HOLDINGS) LIMITEDType: Advertising agenciesIncorporated: 30 October 1895