Oxford University Press has a Dictionary of National Biographies which probably is also available in print, but can be accessed on-line at a premium. It contains biographies of some sixty thousand people in British history, from 400 BC to today. For promotion they have a podcast every fortnight Oxford Biographies that delivers spoken biographies in seven to fifteen minutes. (feed)
By now a wide variety of free audio biographies have accumulated and if they not appear all in the feed, you can find them in thematic sections on the website.
The most recent of the biographies was a very interesting one about Roald Dahl. I loved reading Roald Dahl all my life, but knew next to nothing about his life. The biography serves that purpose and makes connections between the facts of his life and his work. Dahl emerges with an expected contrary nature, but with a few unexpected opinions and remarks.
More Oxford Biographies:
Oxford Biographies podcast review.