[1] She furthered her drama activities in Archway School in Stroud, Glocs.
[1] She originally played Alison Dangerfield in Series 3 and 4 of the BBC drama Dangerfield,[2] before going on to play one of the starring roles (Penny Neville) in the Channel 4 comedy Teachers[3] for three of the programme's four series, and she starred in one of ITV's Poirot adaptations, "Evil Under The Sun".
[2] She appeared in The Bill, and in the detective show A Touch of Frost, and starred in the BBC medical drama Bodies.
[1] Malleson is in a relationship with actor Keith Allen, (father of actors Lily and Alfie Allen),[1] who starred alongside her in Bodies, and the couple have one daughter, Teddie Malleson-Allen (born in April, 2006).
[6] In 2017, Allen and Malleson opened a diner in Stroud, built with the diner set of Kingsman: The Golden Circle in which Allen had appeared.