At the South-West corner of Parliament Square in London is a statue of Nelson Mandela, smiling broadly with his arms outstretched, as if ready to embrace anybody who walks by. The incongruous sight of the great South-African being celebrated in bronze on one of England’s most important political sites is made all the moreso by the collective amnesia that is sometimes applied to great men who grow old. As head of the ANC, an organisation many British Conservatives described as…