Kirsty Young's castaway this week is Sir Sydney Kentridge QC.

Widely regarded as a leading advocate of the 20th century, he continues to make his mark in the 21st; he recently appeared for the first time in the European Court of Justice and at the end of last year he spent the actual day of his 90th birthday working in the English Supreme Court.

Born in South Africa, he was first called to the bar there at the end of the 1940s and played a leading role in some of the most significant political trials of the apartheid era. 'Understated, controlled, relentlessly rational' - and with devastating cross-examination skills - the verdict of one of his clients - Nelson Mandela.

He himself says "I hope there's only one thing about my professional life of which I've boasted and which I think, as a lawyer, is unique on my part - I have acted as an advocate for three winners of The Nobel Peace Prize. I don't think anyone else has done that."

Producer: Isabel Sargent.