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The “four-minute warning” was used for 39 years between 1953 and 1992 and would initiate if the Jodrell Bank Observatory detected a missile inbound for the UK.
As the name suggests, people would only have received short notice when a potential nuclear bomb flew towards the country.
Officials dismantled the system at the end of the Cold War in the early 1990s, as the collapse of the Soviet Union made attacks less likely.
The country doesn’t currently have a dedicated nuclear warning system, but the Government is in the process of creating a UK-wide emergency alert.
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