Guest Stars Jack Deam as DC Ken Blackstone Danny Rahim as DC Tariq Lang Edward MacLiam as David Hornby Lily Loveless as Tracy Banks Emma Fielding as Liz Forbes Wayne Foskett as Martin Soames Finbar Lynch as Ian Bassett David Calder as Jack Barber Shari Fox as Audrey Niven Dominic Marsh as Matt Barber Lladel Bryant as Barista Dominic Doughty as Librarian