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It will also depend on what the public want, says Prof Tony Travers of the London School of Economics.

We were very careful not to assign any political party to either Hagan or President Travers the year before or the other presidential opponent, Patrick Knox.

Yarrow was the tenor in Peter, Paul and Mary, his tender and attentive vocals sandwiched between the soothing baritone of Noel Paul Stookey and the airy contralto of Mary Travers.

Yarrow’s death leaves Stookey as the sole surviving member of Peter, Paul and Mary; Travers died in 2009 at 72.

Senior Coroner Richard Travers said in his findings that Hayden had "obvious needs that were simply not met" by clinicians when his parents took him to the Chelsea and Westminster Hospital in west London in August 2016.