Name	Known for
Connie Booth Jane Thomas Jane Thomas See fewer	Monty Python and the Holy Grail (1975)
Donna Edwards Myfanwy Llewellyn Myfanwy Llewellyn See fewer	Belonging (2000)
Michael Forrest Sergeant Sergeant See fewer	The Avengers (1961)
Dafydd Hywel Henry Parry Henry Parry See fewer	Miss Peregrine's Home for Peculiar Children (2016)
Gerald James Mr. Thomas (Ieuan Ddu) Mr. Thomas (Ieuan Ddu) See fewer	The Man with the Golden Gun (1974)
Delme Bryn Jones Dick Llewellyn Dick Llewellyn See fewer	Off to Philadelphia in the Morning (1978)
David Lyn Joseph Parry Joseph Parry See fewer	Off to Philadelphia in the Morning (1978)
David Markham Sir William Sterndale Bennett Sir William Sterndale Bennett See fewer	Tess (1979)
Gaynor Morgan Rees Anne Parry Anne Parry See fewer	Off to Philadelphia in the Morning (1978)
Dewi Morris Robbie Jones Robbie Jones See fewer	Grand Slam (1978)
Siân Phillips Lina Van Elyn Lina Van Elyn See fewer	Dune (1984)
Gareth Ridgewell Whiley Joseph Parry Joseph Parry See fewer	Off to Philadelphia in the Morning (1978)
William Squire Daniel Parry Daniel Parry See fewer	The Lord of the Rings (1978)
Rachel Thomas Betty Parry Betty Parry See fewer	The Woman Who Wouldn't Die (1965)