Shirley Henderson
From Tardis Wiki, the free Doctor Who reference
Shirley Henderson played Ursula Blake in the Doctor Who television story Love & Monsters.
Among her non-Who roles, she appeared as Moaning Myrtle in several of the Harry Potter films, including Harry Potter and the Goblet of Fire which also featured David Tennant. She appeared in the mid-1990s TV series Hamish Macbeth and in Trainspotting as Spud's girlfriend, Gail.