A fleet of 250 model lifeboats have made waves in the River Thames as the RNLI held a charity Alternative Boat Race to boost the rescue institution's funds.
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The Hollywood actor died of complications from surgery.
Celebrities lined up to be photographed with the characters, who famously have antennas on their heads and TV screens on their stomachs.
The Olympic champion released a statement after a newspaper alleged his American coach may have broken anti-doping rules.