As Holland and Smith wanted a diverse cross-section from the East End community, it was decided that one of the main cast had to be a young, single mother, and as punk music was prominent in British culture at the time, they decided to use a punk image for the character. Holland and Smith decided to cast an unknown actress in the role. They chose Linda Davidson, who was the right age and had been brought up in northern England and therefore had an accent that would befit the character's background. However, actress Jenna Russell revealed in 2016 that the part was originally offered to her, saying, "I was asked to play Mary Smith in the show right in the beginning when it started in 1985, but I was very young and it wasn't the right fit for me then".