Ofcom Telephone Numbering Program - The London Project" (PDF). Office of Communications .ofcom.org.uk/research/telecoms/reports/numresearch/tnplondon.pdf
Ofcom Research Telecoms Reports Numresearch
Web Site
Ofcom Research Telecoms Reports Numresearch Tnplondon Pdf - Dial - England Phones
Ofcom Research Telecoms Reports Numresearch Tnplondon Pdf - Dial - England Phones
Ofcom Research Telecoms Reports Numresearch England
