These days, Rosie Holt finds it hard to travel light. She’s only popping to Liverpool for a couple of days, she tells me, self-consciously wheeling a suitcase into a moodily lit King’s Cross coffee shop, but even that’s too long to be without her phone stand and microphone. Such is the heavy burden of the social media comedy star. Holt shot to fame four years ago with her eerily convincing parodies of condescending Tory MPs shamelessly defending the government’s latest disaster, and smug rightwing commentators frothing about the issues of the day. She specialises in the kind of furiously topical...