Helen Christine Blatch (née Wilson; 24 January 1934 – 31 December 2015)[1] was a British actress on stage and screen, best remembered on screen for her roles in Doctor Who (in the serials The Deadly Assassin and The Twin Dilemma)[2] and The Practice, and on stage for her casting as "Cerimon, a lord of Ephesus", in the Royal Shakespeare Company's 1989–1990 performance of Pericles.[3]