Stage Three of the Tour de France next summer is expected to start in Cambridge and head south to London before making a circuit of the Olympic Park. It's reported it'll ultimately finish on the Mall with Buckingham Palace as a backdrop.
The finish will be the same one used for the Olympic road races last summer.
More than a million spectators watched the prologue in Central London in 2007 and police estimated more than 1.5 million people were roadside the following day for stage two to Canterbury.
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Holidaymakers reported long queues at check-in desks at the airport on Friday morning.
The events were cancelled on Wednesday in the wake of the Manchester attack to allow police officers to be re-deployed.
The men were detained as part of an investigation by MI5 and the Metropolitan Police's Counter Terrorism Command.