On the eve of celebrating the twentieth anniversary of Nelson Mandela’s release from prison, the Centre of Governance and Human Rights (CG+HR) hosted a roundtable discussion at King's College, Cambridge, with leading academics on Southern Africa - Stephen Ellis, Saul Dubow and Jocelyn Alexander - and Paul Trewhela, the author of a provocative new book 'Inside Quatro' on the human rights records of the ANC and SWAPO in exile. Chaired by the BBC World Service's Africa Editor, Martin Plaut.