The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
Happened as dated, per the source: "a single telephone call changed the history of London and the United Kingdom forever."
MoneyWeek confirms "The Post Office (now BT) Tower was officially opened on 8 October 1965 by the prime minister, Harold Wilson, who made a telephone call to the Lord Mayor of Birmingham," an exact match to the pin's stored date.
Wikipedia's history of BT Tower notes "The first microwave link was to Norwich on 1 January 1965," several months before the pin's stored 8 October 1965 date - a related but earlier operational milestone, with the tower's public opening tied instead to Harold Wilson's telephone call that October per MoneyWeek's[2] account.
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