South Africa's President Cyril Ramaphosa paid tribute to Queen Elizabeth II's "wonderful" relationship with Nelson Mandela in a speech at the conclusion of his state visit to the UK.Mr Ramaphosa said he was pleased the King had honoured his mother's invitation to him, adding: "We honour her, and we remember her very fondly – particularly for her wonderful relationship with the father of our nation, Nelson Mandela."Their relationship will forever be imprinted in our memory, because they were very close. They were on first-name terms, and it was always a joy to listen to Nelson Mandela speaking about her very warmly and very fondly."