[car_analogy]

But ultimately the government decides who is in charge of the BBC, with only minor indirection: https://en.wikipedia.org/wiki/BBC_Board

[pessimizer]

And everybody who worked there was vetted by MI5 for political opinion: https://www.bbc.co.uk/news/stories-43754737

[bobsmooth]

I guess being a nonce isn't "subversive".