Name	Known for
Nerys Hughes Megan Roberts Megan Roberts See fewer	The Liver Birds (1969)
Freddie Jones Dr. Emlyn Isaacs Dr. Emlyn Isaacs See fewer	Dune (1984)
Nicholas Jones Dr. James Isaacs Dr. James Isaacs See fewer	In the Heart of the Sea (2015)
Edward Hardwicke Professor Lambert Professor Lambert See fewer	Elizabeth (1998)
Christine Pollon Dilys Humphries Dilys Humphries See fewer	The Avengers (1961)
Janet Aethwy Ruth Jones Ruth Jones See fewer	Patagonia (2010)
Jack Walters 'Captain' Mansel 'Captain' Mansel See fewer	The Englishman Who Went Up a Hill But Came Down a Mountain (1995)
Iola Gregory Matron Matron See fewer	Cravings (2006)
Owen Garmon R.T. Williams R.T. Williams See fewer	The Proposition (1996)
Carol Holmes Marie Anderson Marie Anderson See fewer	Milk & Money (1996)
Di Botcher Eirlys Prosser Eirlys Prosser See fewer	Victor Frankenstein (2015)
Dafydd Edmwnd Gwilym Prosser Gwilym Prosser See fewer	Hedd Wyn (1992)
Martin Gower Eddie Jones Eddie Jones See fewer	Doctor Who (1963)
Beryl Hall Mrs. Jones Mrs. Jones See fewer	The District Nurse (1984)
Lisa Palfrey Jane Sanderson Jane Sanderson See fewer	Guest House Paradiso (1999)
Menna Trussler Mrs. Sanderson Mrs. Sanderson See fewer	Pride (I) (2014)
Michael Hughes Mr. Sanderson Mr. Sanderson See fewer	Winter Flight (1984)