My wife, Diana Ellis, who has died aged 80, was a barrister specialising in criminal and international law. She also served as a recorder (a part-time judge), and was appointed QC in 2001. But this conventional career followed a period of radicalism which, during the era of apartheid, included a risky clandestine mission to South Africa.In the late 1960s, intent on becoming a social worker, she had enrolled at the London School of Economics to study for a diploma in social administration. While