Well-known interviewers choose the people they wish to interview.

"As Chairman of the International Publishing Corporation, the world's largest press empire (including sixteen newspapers and over two hundred magazines), Mr. Cecil King is regarded as one of the most powerful men in Britain. But just how powerful is he? Is he after political power for himself? Why has he apparently lost faith in a Prime Minister whom he once championed? And precisely what kind of leadership does he seek for Britain?"
...is why Robin Day talks to Cecil King.