Guest Stars Oscar Unsworth as Rhodri Howells Harry Unsworth as Rhodri Howells Mark Lewis Jones as Steve Baldini Hannah Daniel as Cerys Jones Eiry Thomas as DI Susan Williams Lacey Jones as Megan Howells Demi Letherby as Alys Howells Aneirin Hughes as Tom Howells Bradley Freegard as Evan Howells Suzanne Packer as Delyth Lloyd Catherine Ayers as Lisa Connors Rhian Morgan as Marion Howells Martha Bright as Angie Baldini Sion Daniel Young as Gareth Taxi Celia Imrie as Rose Fairchild Matthew Aubrey as Mike Taylor Keogh Kiernan as Osian Maria Pride as Julie Penry Marc Antolin as Professor Rhys Isaiah Cai Forrest as Lewis Kev McCurdy as Joe Price Rachel Cheung as Gym Manager Bence Kalo as Dr Macon