Katie Razzall: Robust leadership needed to steer BBC through crisis

I don't like the word unprecedented. But I've used it twice in less than 24 hours.The first time was on Sunday night, after the resignations of Tim Davie and Deborah Turness. That, in fact, might have involved a bit of overreach.After all, this has happened before at the BBC. Back in 2004, two senior figures departed - admittedly not on the same day, but on subsequent days.The then BBC chairman, Gavyn Davies, and…