Speaking in Johannesburg during a four-day visit to the country, Mr Caborn said:

"It is an honour to have such a respected international figure supporting our 2012 Olympic and Paralympic bid.

"The recent history of South Africa shows the power of sport to bring communities together.  This is our aim for a London Games, to help unite the nations of the world in one of its most diverse cities.

"Nelson Mandela's backing for London 2012 is a powerful indication of the breadth of support that our bid is receiving all over the world - and a recognition of the special qualities and values we think a London Games would bring to the Olympic movement."