Rebecca Adlington spoke to our reporter Emma Walden at an event designed to inspire the next generation of Olympic swimmers.
She said that working with kids was one of the best parts of her job as an elite athlete.
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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.