Lesley Scott
From Tardis Wiki, the free Doctor Who reference
Lesley Scott was credited as co-writer on the Doctor Who serial The Ark with her then husband, Paul Erickson.
Although Scott was the first woman credited with writing for the series, she actually did no work on the scripts; and has no other known contributions to television or film. Her on-screen writer's credit was part of "a personal arrangement" Erickson had with her at the time. (REF: Doctor Who The Handbook: The First Doctor)