Britain's Olympic sailors will parade through Weymouth in Dorset later ahead of the town carnival.
Among those expected to appear are Hampshire's Ben Ainslie who won the Finn class, claiming his fourth Olympic gold medal; windsurfer Nick Dempsey, Hannah Mills and Saskia Clark, Luke Patience and Stuart Bithell, Iain Percy and Andrew Simpson.
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Singer Billy Bragg and TV presenter Chris Packham were among the campaigners taking a stand in Hyde Park.