father, Alan, now 54, who acts as her unofficial taxi service, had begun to feel disillusioned even before the invasion of Iraq. “The first thing that made him raise his eyebrow was how Tony Blair, one of the first things he did was build the Millennium Dome. He thought: what? We’ve just had however many years of Tory rule, this place is decimated – and you’re building the Millennium Dome?”

Black tells me this over a cup of tea in a Paisley café. Her supporters have abandoned canvassing a local estate, as the rain was ruining the sheets on which the party records voter intentions. On the doorsteps, she mixed wry friendliness with a passionate polemic against austerity and marginalisation of Scotland at Westminster. It wasn’t always an easyShe sips her drink. “We were scrambling, trying to get stuff together, just teas and biscuits. . . I was just thinking: that’s Victorian.”

If elected, Black could be the youngest MP in the Commons – although she is not the youngest candidate, as Labour are fielding a 19-year-old called Ollie Middleton in Bath. She is a third year student in politics and public policy at the University of Glasgow, with a final exam on 25 May, for which I suspect she is not currently doing much revision.

The biggest threat to her candidacy came on its second day, when the Daily Record found a video of her addressing a Hope over Fear rally in George Square. On the night of the referendum, she told the crowd: “We had to