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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Rain will quickly spread to all parts, becoming heavy at times.
Sam Baker suffers from an eye condition meaning he needs to use a cane. The 11-year old says not all cane users are completely blind.
Remaining showers will clear through this evening, then largely clear at first tonight.