General

BT Directory Enquiries
OFCOM
Communications and Internet Services Adjudication Scheme (CISAS)

Broadband

BT ADSL Checker – check broadband and superfast broadband availability
Sam Knows – useful for checking exchange information

Telecoms glossaries

Metronet Ethernet Forum –  – a comprehensive glossary for Ethernet technology
Ofcom Glossary

Numbering websites

Useful UK Code location search tool
Country Calling Codes
World Telephone Numbering Guide

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