Sorry, I didn't mean English more than British (the distinction being a bit too subtle for me to make). It's "par for the course" I guess for a national broadcaster, but:

* That doesn't mean it's not less than ideal.

* It's something one might want to bear in mind, when listening, since it might introduce some kind of a bias to the whole thing (maybe the other comment about number of episodes about european vs african history is a good argument in that direction)