With the resignation of Tony Hall as director general, there is talk of an ‘existential crisis’ at the BBC. The corporation is facing yet more budget cuts and the further centralisation of commissioning. Hall’s departure follows Boris Johnson’s threat to boycott the Today programme and Samira Ahmed’s successful equal pay claim. The prime minister and his consigliere Dominic Cummings are said to want to intervene in the appointment of the new director general. Who will come to the BBC’s rescue?