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The light which sits above the Big Ben bell at the top of the Elizabeth Tower, was switched off at the outbreak of war in 1939 to comply with blackout regulations.

The mostly flat route takes in several other London landmarks, including Tower Bridge, Canary Wharf and Big Ben.

Heard Island, though, is barren, icy and completely uninhabited - home to Australia's largest and only active volcano, Big Ben, and mostly covered by glaciers.

The barefoot man was brought down in a cherry picker as Big Ben struck midnight, after more than 16 hours on a ledge several metres up the tower.

Emergency services were called to the Elizabeth Tower, which houses Big Ben, at 07:24 GMT on Saturday and spent hours managing the incident.