The UN and celebrities including Richard Branson, Lewis Hamilton, Eddie Izzard and Jamie Oliver are supporting Mandela Day, celebrating Nelson Mandela's 94th birthday today by encouraging people to dedicate 67 minutes of their time to public service, recognising his 67 years of serving others.

The Mandela Day Pledge Book opens online today and one winner will fly to Johannesburg with South African Airways to present the book to the Nelson Mandela Foundation.