Sir Chris Hoy enjoys his return to Olympic Park

The six-time gold medallist track cyclist grinned as he sounded the horn to start today's five-mile race into the Olympic Stadium. Credit: Matt Alexander/PA Wire

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Stars run at Olympic Stadium

Marathon world record-holder Paula Radcliffe will run the first event to be staged at London's Olympic Stadium since the 2012 Games later today. The National Lottery Anniversary Run is a five-mile race.