"Heaven," In Our Time, BBC Radio 4, December 22, 2005.

  "Greyfriars And Blackfriars," In Our Time, BBC Radio 4, November 10, 2005.

  "The Schism," In Our Time, BBC Radio 4, October 16, 2003. 

  "The Cathars," Connection, WBUR, September 4, 2001.