In the first of a two-part profile, Daniel Boffey traces the incoming PM’s early forays into politics and his rise to prominence – ultimately leading to him leaving London for Manchester

Andy Burnham had emerged victorious, but niggling doubts remained about his mandate. It was the summer of 1987 and the 17-year-old had represented Labour in a school hustings as Margaret Thatcher and Neil Kinnock were battling it out in that year’s general election.