If you get close to the River Thames in the next couple of days, you might see some cruise ships and superyachts leaving after the Olympics.
As the Port of London Authority website explains:
More than 20 vessels including cruise ships, sailing ships and super yachts came specially to London in the two weeks running up to the Games. Now they all want to leave in the space of 72 hours. Vessel departures already planned, with more bookings expected, include:
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Monday, 13 August: Sailing ship, Belem***
Cruise ships Caledonia Sky* and Deutschland*
Royal yacht, Dannebrog*
Super yacht, Deniki*
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Tuesday, 14 August: Sailing ship, Stad Amsterdam*
Cruise ship, Braemar**
Super yachts, Seanna and Octopus*
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Wednesday, 15 August: Cruise ship, Gemini**
Incidentally, the Dannebrog is the Royal Danish Yacht. The Octopus is the megayacht owned by Paul Allen, co-founder of Microsoft.