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• London Telephone Numbers
  New sub-range for London: (020) 3
• Evaluation of Directory Enquiry Services
  Ofcom/ICSTIS research - March 2006
• Evaluation of Directory Enquiry Services
  Ofcom and ICSTIS research - March 2005
• Evaluation of Directory Enquiries services
  Ofcom and ICSTIS research - June 2004
• Telephone Numbering Program: The London Project [pdf]
  Market research to assess the impact of the introduction of (020) 3 numbers, and to inform the development of Ofcom's communications campaign. November 2004
• London telephone numbers: New sub-range for London (020) 3 [pdf]
  This report provides an overview of the key findings of residential and SME consumer awareness and perceptions of London dialling codes, taken from surveys conducted in August 2004.
• Evaluation of Directory Enquiries services [pdf]
  Ofcom and ICSTIS research; May 2004

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