"The world does not need a mini-Boris," says Jo Johnson, the journalist-turned-politician trying to escape the shadow of his journalist-turned-politician brother in their dynasty of journalists and politicians. "It would be a disaster if I tried to pass myself off as him." The Conservative MP for Orpington is sibling number four in the Johnson clan. After Boris, comes The Lady editor Rachel, entrepreneurial Leo, Jo and then two half-siblings, Julia and Max. Jo is considered the "sensible" one: "There was no point trying to be the loud one."

If Boris is the showman and the stand-up comic, Jo seems to have a better eye for detail. Some have suggested the two could one day compete for the top job in the party, Miliband-style, although Jo describes Labour's filial battle as "unedifying". Perhaps a BoJo-JoJo double-act at 10 and 11 Downing Street might be an alternate vision of the future? Jo gives the perfect politician-being-grilled-on-the-Today-programme response: "We have in David Cameron the right man for the right time. I am full-square behind him and George Osborne."

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