According to Dora - Production & Contact Info

Name	Episodes	Known for
Dora Bryan Self / Various Self / Various See fewer	15	A Taste of Honey (1961)
Diana King Various Various See fewer	7	Pink Floyd: The Wall (1982)
Terence Brady Various Various See fewer	7	Pig in the Middle (1980)
Mark Wynter Various Various See fewer	7	Superman (1978)
Joan Sims Various Various See fewer	4	Carry on Up the Khyber (1968)
Patricia Hayes Various Various See fewer	3	Willow (1988)
Ronnie Stevens Various Various See fewer	3	The Parent Trap (1998)
John Junkin Various Various See fewer	3	A Hard Day's Night (1964)
Rex Garner Various Various See fewer	3	The Wednesday Play (1964)
Tim Barrett Various Various See fewer	2	The Avengers (1961)
Eleanor McCready Various Various See fewer	2	Sense and Sensibility (1995)
Aubrey Woods Various Various See fewer	1	Willy Wonka & the Chocolate Factory (1971)
Hugh Paddick Various Various See fewer	1	The Larkins (1958)
Michael Stainton Various Various See fewer	1	You Must Be the Husband (1987)
Barbara New Various Various See fewer	1	You Rang, M'Lord? (1988)
June Whitfield Various Various See fewer	1	Absolutely Fabulous (1992)
Wilfrid Brambell Various Various See fewer	1	A Hard Day's Night (1964)
Kenneth Connor Various Various See fewer	1	Carry on England (1976)
Richard Wattis Various Various See fewer	1	Hobson's Choice (1954)
Graham Stark Various Various See fewer	1	The Return of the Pink Panther (1975)
Clive Dunn Various Various See fewer	1	Dad's Army (1968)
Tony Selby Various Various See fewer	1	Burnside (2000)
Richard Caldicot Various Various See fewer	1	Strife (1960)
Jill Martin Various Various See fewer	1	The Streets of San Francisco (1972)
Deryck Guyler Various Various See fewer	1	A Hard Day's Night (1964)
Doug Fisher Various Various See fewer	1	Man About the House (1974)
Peter Reeves Various Various See fewer	1	What a Girl Wants (2003)
Barrie Gosney Various Various See fewer	1	Don't Just Lie There, Say Something! (1974)
Barbara Miller Various Various See fewer	1	Love and Kisses (1955)
Joyce Grant Various Various See fewer	1	Village Hall (1974)
Michael McGovern Various Various See fewer	1	Dirty Games (1989)
Alan Melville Various Various See fewer		Beryl Reid (1977)