David Dimbleby's BBC documentary explores the purpose of the Royal Family

What David Dimbleby established right at the start of his new documentary, What's The Monarchy For?, was the essential role the BBC plays in the continued existence of the Windsors. The Dimbleby dynasty played an especially crucial role, he implied. 'I seem to have been reporting on the monarchy forever,' he explained, as archive footage reminded us how it was he, even more than the Archbishop of Canterbury, who was the presiding dignitary at the wedding of Charles and Diana.