A group of veterans will gather at Bletchley Park near Milton Keynes today to celebrate the 70th anniversary of the world's first electronic computer.
The Colossus was developed for British code-breakers during the Second World War to help them read and intercept high-level German army messages.
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The Met Office has issued a yellow cold weather alert and there's the risk of snow in places later on Boxing Day.
Mostly dry and bright, but chilly. Frost tonight.
Most places will see bright or sunny spells through the day, but with a few showers around, especially during the morning.