Susan Joan Holderness (born 28 May 1949) is an English actress on both stage and screen having had appearances in Bless This House (1974), The New Avengers (1977), Canned Laughter (1979),
The Sandbaggers (1980), The Cleopatras and It Takes a Worried Man (1983), The Brief and Minder(1984), Doctors (2004-2014), Still Open All Hours (2018–2019) EastEnders and The Madame Blanc Mysteries (2021). However, she is best known for her role as Marlene Boyce in Only Fools and Horses from 1985 to 2003, and its spin-off The Green Green Grass from 2005 to 2009.
Holderness was born on 28 May 1949, in Hampstead, London. After taking her A-levels, she trained at the Central School of Speech and Drama.
She began her acting career with the Manchester 69 Theatre Company in A Midsummer Night’s Dream, Peer Gynt and as Desdemona in Catch My Soul (Jack Good's rock-musical version of Othello). She has worked consistently in theatre, radio, film and television. West End plays include The Female Odd Couple, Why Not Stay for Breakfast, The Male of the Species and the highly acclaimed one-woman play Our Kid (based on Myra Hindley).

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