The family of Great Britain’s Tom Dean celebrated like “lunatics” after he claimed an Olympic gold medal in the men’s 200 metres freestyle, his mother has said. Dean, 21, who was “knocked for six” after contracting coronavirus for a second time earlier this year, finished in a time of one minute and 44.22 seconds, ahead of his British compatriot Duncan Scott, at the Tokyo Aquatics Centre. His mother Jacquie Hughes, 58, speaking to the PA news agency, said up to 70 family and friends watched the race in her garden in Maidenhead, Berkshire, despite the event starting in the early hours of Tuesday. She said: “To be honest I haven’t taken it all in yet, everything has been so nerve-racking, the final was amazing and that with the lack of sleep has meant I’m on an adrenaline-filled rush. “I know Tom feels the same way, he told me it’s like …