A seven-year-old boy swims 21 miles to help other children.
Joseph Purcell decided to act after seeing television pictures from war-torn Syria.
So the youngster, who is from Wokingham, persuaded sponsors to back him as he tackled a distance equivalent to the English Channel.
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A lamp in the tower which houses Big Ben is to be switched off for the first time in more than 70 years.
Sir Bruce entertained audiences for more than seven decades.
Work in the tower will also pause over the bank holiday weekend.