From the revelations about Jimmy Savile in 2012 to the gender pay gap debacle in 2017, the BBC was for many years its own worst enemy. Now, confronted with a rampaging US president and increasingly confident domestic opponents, some of whom sit on the corporation’s board, the BBC is embroiled in a crisis that has so far seen the resignations of two senior executives and the threat of a billion-dollar lawsuit from Donald Trump.

