Sinead Keenan
From Tardis Wiki, the free Doctor Who reference
Sinead Keenan, an Irish actress who has been active in British TV for several years, played Addams in the Doctor Who television story The End of Time, Margery Phipps in the Big Finish Doctor Who audio story Council of War, and Stephanie Wilton in The Reesinger Process.
She is the elder sister of Rory Keenan.