Tapping into half a century of experience of covering the conflict in Northern Ireland, the celebrated and multi-award-winning BBC TV journalist and author, Peter Taylor, assesses the contribution to the peace process of the one-time militant IRA commander, Martin McGuinness. How he progressed from leading the Derry IRA in the 1970s to becoming an unlikely half of the so-called ‘Chuckle Brothers’ duo with Rev. Ian Paisley, when he became Deputy First Minister of Northern Ireland and, in a remarkable transformation, went on to dine with the Queen at Windsor Castle in white tie and tails.