Guest Stars Dean Lennox Kelly as Carmichael Geraldine Somerville as Lydia Hamilton Joanna Horton as Suzie Banks Sam Strike as David Hamilton Georgie Glen as Professor Belinda Roach Liza Tarbuck as DI Pamela Rankin Thomas Coombes as DS Calvin Jones Dean Andrews as Tony Hamilton Dan Fredenburgh as Scott King Jonathan Broadbent as Daniel Rowland David Cann as DI Murray Porter Ariyon Bakare as Father Anthony Dawes Christopher Sciueref as Hiro Koteas Sagar Arya as Depak Shah Lily Lovett as Sophia Haddon