Guest Stars Eiry Thomas as Greta Collinson Christian Patterson as Rhys Griffiths Ashley Thomas-Evans as Greta's Son Sam Rees as Angela's Son Kai Owen as Alan Kethin Phaldut Sharma as Doctor Whittaker Ifan Huw Dafydd as Bill Lewis Clare-Louise English as Doctor Thompson Morgan Llewelyn-Jones as Griff Cook Owain Gunn as Mark Jones Samantha Spragg as Seren Collinson Lauren Jackson as Tina Edwards Georgia Reed as Mel Price Millie Davies as Ava Driscol Joely Curran as Tessa Collins Emily May as Mia Griffiths Oliver Ryan as Sergeant Guy Hughes Camilla Marie Beeput as Nurse Terra Malcolm Jacob Ifan as Gethin Brendan Hughes as Heath Thompson Rhiannon Meades as Nurse Gloria Roberts Oliver Llewellyn Jenkins as Reporter