The reaction to Molly this series has completely taken me by surprise. I did my day or two filming, like last time. But this year - because of the frankly brilliant writing - I think people have noticed her. Which is amazing. Molly works because, while Watson is “the audience”, Molly is every woman of a certain age sitting at home on the settee fantasising about running their hands through Benedict Cumberbatch’s hair. Which is basically what I’d have been doing if I wasn’t in the show… Also, I think most people have experienced the agony and the ignominy of unrequited love… I’ve never thought Molly was an idiot. She just really, really loves him.