Hi jno
I got it from this recent report
http://m.bbc.co.uk/news/world-africa-22069896
//ONE OF Nelson Mandela’s closest friends has claimed the late Margaret Thatcher played a role in sparing the life of the man affectionately known by his clan name Madiba.
Ahmed Kathrada, one of the nine other men in the dock with Mandela when on trial between 1963 and 1964 for the charge of attempting to overthrow the apartheid regime, said he was “sure” Britain’s first female prime minister helped South Africa’s first black president.
During his and Mandela’s trial Thatcher had not yet become prime minister; she was a frontbench MP in Harold Macmillan’s government.
“We were well aware that there was all sorts of pressure from South Africa and abroad – pressure from people not necessarily agreeing with the ANC's policies,” Kathrada added.
Prosecutors charging Mandela, Kathrada and the others had originally sought the death penalty, however, the judge eventually decided to impose sentences of life imprisonment.
“I had the opportunity to accompany [Margaret Thatcher] a few years ago,” said the 83-year-old South African, born to Indian immigrant parents.
“She assured me that she had played a positive role during our trial.//