If you're on a stopover in London and looking for things to do, consider visiting One Canada Square, Marble Arch, or Buckingham Palace. One Canada Square, Marble Arch, and Buckingham Palace can be visited by travelling about 30,5 km, 21,1 km, and 22,1 km respectively from London Heathrow. Those on a stopover in London in need of a car hire can book one at London Heathrow for about R536.