Hertfordshire hero Andy Nation has set off on his 147 mile swim from Teddington Lock to Calais on after being forced to postpone the swim when he suffered a fall and broke his neck in June 2012.
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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.