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A BT site engineering code is a group of letters assigned by BT, or its predecessor the General Post Office, to a physical location which is equipped by the company with unusual amounts or types of telecommunications.
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Such codes relate to both BT's own buildings and major customer sites.
Historically, site codes beginning with the letter Q were government or defence sites. [1] Codes beginning with the letter Y were radio-related sites. The latter category broadened somewhat over time to include many other kinds of customer site.
