Former six times world champion swimmer Mark Foster has told Daybreak he learnt to swim because his father was "petrified of water".
He said: "It was safety reasons, first and foremost. My father at the age of 11 got thrown in the lake and was petrified of water, [he] still can't swim."
He added: "I think if you are a family, sitting round a poolside, constantly looking over your shoulder, how do you relax when you know your child can't swim and how does your child enjoy itself?"
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The Sherlock actor made the comment while he received an award for his humanitarian work.