A man who worked against and with Nelson Mandela paid tribute to the "incalculable" impact he had on South Africa and the world. Pik Botha served as his country's foreign minister in the last few years of the apartheid regime, and helped negotiate Nelson Mandela's release from prison in 1990.
Mr Botha said he was grateful to have known and worked with Mandela, whom he later became friends with. He said the challenge for South Africa now is to sustain his legacy, as Mark Austin reports.
Nelson Mandela's first ever television interview was given to ITN reporter Brian Widlake in May 1961.
Former ITV News presenter Sir Trevor McDonald was the first journalist to interview Nelson Mandela after his release from prison in 1990.
Nelson Mandela was a towering figure of utter integrity who will be remembered as the greatest African.