Sheila Sim obituary
Actor who starred as Mollie Ralston in The Mousetrap with her husband, Richard AttenboroughWhen Agatha Christie's murder mystery play The Mousetrap opened in London in 1952, the actor Sheila Sim, who has died aged 93, had doubts about its ability to last for six months. But the fact that she could wait until just before its 50th anniversary before publicly confessing those doubts at a lunch at the Savoy hotel with 30…