| Episode credited cast: |
 | Michael Pennington | - | Himself - Narrator (voice) |
| Rest of cast listed alphabetically: |
 | David Aaronovitch | - | Himself - Columnist, The Guardian |
| Sarah Dunant | - | Herself - Historical Novelist |
| Ruth Gledhill | - | Herself - Religion Correspondent, The Times |
| Robin Griffith-Jones | - | Himself - Master of the Temple, Temple Church, London |
| Richard Leigh | - | Himself |
| James McConnachie | - | Himself |
| Fred Piper | - | Himself - Professor of Mathematics, Royal Holloway |
| Jonathan Riley-Smith | - | Himself - Ecclesiastical Historian, Cambridge |
| Brian Sewell | - | Himself - Art critic, The Evening Standard |
| Jack Valero | - | Himself - Opus Dei UK Director |
| Evelyn Welch | - | Herself - Professor of Renaissance Studies, Queen Mary |
| Mike West | - | Himself - Chancellor, Lincoln Cathedral |
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