Eden Monteath
From Tardis Wiki, the free Doctor Who reference
Eden Monteath played one of the shapes of Prisoner Zero and was credited as Child 1 in Doctor Who television story The Eleventh Hour. She also voiced Clara in Jago & Litefoot audio story The Man at the End of the Garden.
Her appearance in The Eleventh Hour was alongside her younger sister, Merin. (BFX: Jago & Litefoot: Series Three)