Linda Davidson established her acting career with her breakthrough role as Mary Smith in the BBC soap opera, EastEnders, making her on-screen debut in March 1985. She portrayed the character until 1988, involved in significant storylines addressing complex social issues. Following this, she continued with appearances in various television programs and stage productions, including First of the Summer Wine (1988), Casualty (1990), The House of Eliott (1992), and The Bill (1993). A notable stage role was Columbia in the first West End revival of The Rocky Horror Show in 1990.
Her iconic role as Mary Smith was reprised for single episodes of EastEnders in 2019 and again in 2022 for the funeral of Dot Branning, reminding audiences of her influential early career while continuing her impactful work as a digital disruption expert.