Lucy Baker
From Tardis Wiki, the free Doctor Who reference
Lucy Baker (born 25 June 1970) played young Nyssa in the Doctor Who television story Mawdryn Undead, but was uncredited both on-screen and in Radio Times despite having dialogue, albeit one word: "Doctor!" (DWM 234) She also appeared in The Five(ish) Doctors Reboot.
She is the daughter of Sixth Doctor actor Colin Baker, and went to boarding school with Georgia Moffett. (REF: The Doctor: His Lives and Times)
Before appearing in EastEnders as Lisa Fowler between 1998 and 2003 and 2010, she changed her name to Lucy Benjamin. While appearing in the soap, she dated cast member Steve McFadden (Phil Mitchell).
