In the wake of the crisis that engulfed the BBC over the splicing of Donald Trump’s speech on the broadcaster’s Panorama programme, culminating in the departures of director-general Tim Davie and head of news Deborah Turness, an amusing meme was doing the rounds on social media. It showed a smiling Sam Allardyce, box of possessions in hand, under the headline: ‘BBC appoints Big Sam to shore things up until the end of the season.’