Guest Stars Phil Davis as DI Liam Cox Bronagh Waugh as DC Stella Beckett Sarah Niles as DCI Jill Conroy Amy Wren as Gemma Hillman Catherine Tyldesley as Kate Tuckman Marcus Garvey as DC Roly Dalton Dominic Allburn as Carl Tuckman Erin Shanagher as Fiona Baker Fehinti Balogun as Greg Sullivan Shannon Murray as Hayley Jones Karen Henthorn as Janice Baines Andrew Hawley as Tim Kíla Lord Cassidy as Caitlin Sterling Hubert Hanowicz as Pavel Ludic Sia Kiwa as Melissa Lucy Chambers as Chloe Tuckman Ian Puleston-Davies as Donald Vernon Phillip Langhorne as Dominic Banley