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 Aneirin Hughes as Tom Howells Demi Letherby as Alys Howells Bradley Freegard as Evan Howells Suzanne Packer as Delyth Lloyd Catherine Ayers as Lisa Connors Alex Harries as Arthur Davis Rhian Morgan as Marion Howells Martha Bright as Angie Baldini Rhashan Stone as DI Laurence Breeze Celia Imrie as Rose Fairchild Matthew Aubrey as Mike Taylor Keogh Kiernan as Osian Maria Pride as Julie Penry Siân Phillips as Judge Owens Sean Fletcher as Sean Jenkins QC Bence Kalo as Dr Macon