The show was set in the late 19th or early 20th century. It was about a man who moved to london with his second wife and child to do some work involving gas. there hired a nanny who fell in love with the mans first son who was a doctor. the guy later killed his wife with the gas fire and tried to blame the nanny when his son found out. i know its not must to go on but i can not remember the name of the show or of the actors, and it bugging me. thanks for any answers