Philip Glenister Harry Venn Actor Thekla Reuten Gina Hawkes Actor David Suchet Sir Nigel Fountain Actor Richard Dormer Frank Hanna Actor Mark Powley Mark Venn Actor Peter Guinness Jason Styles Actor Benjamin Smith Matt Actor Matthew Marsh James Morpeth Actor Paul Ritter Stevie Quirke Actor Thomas Craig DS, DI Fenton Russell Actor Anna Chancellor Elspeth Vereny Actor Bertie Carvel Actor Andrew Bicknell Actor Niall MacCormick Director Stephen Wright Executive Producer Christopher Hall Producer Ed Rubin Executive Producer David M. Thompson Executive Producer