This is seismic. To lose both the director general and the CEO of BBC News at the same time is unprecedented. It's an extraordinary moment in the history of the BBC.
It can't be underestimated.
On the face of it, Tim Davie's resignation makes some sense.
I have wondered for some time whether he was weighing up how much longer he wanted to stay in a job that is highly pressurised.
There have been occasions when I have interviewed him this year, as the controversies mounted, and he didn't seem his usual Tigger-ish self.
