Jonathan Ashworth has started carrying a card in his shirt pocket. It’s the licence his father was given when he got a job in the 1970s at the Playboy casino in Manchester. ‘It’s silly, really. But it’s just a reminder that my dad was able to start a job as a croupier from a very poor working-class background in Salford and that completely changed his life,’ the shadow work and pensions secretary says when we meet in his Commons office.