999
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Information Room, circa 1960
The General Post Office, which ran the telephone network, proposed a three digit number that could trigger a special signal and flashing light at the exchange. The operators could then divert their attention to these priority calls.
In order to find the new emergency number in the dark or thick smoke it was suggested an end number was used so it could be found easily by touch.
111 was rejected because it could be triggered by faulty equipment or lines rubbing together. 222 would have connected to the Abbey local telephone exchange as numbers in the early telephone network represented the first three letters (ABBey = 222, 1 was not used due to the accidental triggering). 000 could not be used as the first 0 would have dialled the operator.
999 was deemed the sensible choice.