Christopher Eccleston wrote:
I left Doctor Who because I could not get along with the senior people. I left because of politics. I did not see eye-to-eye with them. I didn’t agree with the way things were being run. I didn’t like the culture that had grown up around the series. So I left, I felt, over a principle.
Yeah, I wouldn't call Keith Boak a "senior" person at the BBC. He's obviously referring to Collinson and RTD. Boak would have had no influence on the "culture that had grown up around the series".