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 Suzanne Packer as Delyth Lloyd Bradley Freegard as Evan Howells Catherine Ayers as Lisa Connors Martha Bright as Angie Baldini Rhashan Stone as DI Laurence Breeze 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 Dan Thomas as David Tate Karl Johnson as Lord Justice Prentice