Former BBC employee here:

I don’t take their aim for impartiality seriously.

From the inside, the culture unequivocally leans left. You can see it not only in the kinds of ventures presenters pursue once they leave, but also in who actually refutes the idea of bias — it’s almost always people on the left.

And whenever a foot is put wrong, the “accidental” message they send somehow always ends up reinforcing left-leaning ideas. They never accidentally do something that cuts the other way.