"I have a twin sister whose name is Anne, and as we live in the same city I’m constantly getting mistaken for her, and people are always asking ‘Are you Helen or Anne?’ And I’m so bored with the question, and I’m not listening, and I say ‘Anne’ without thinking. And then I realise and is it better to say, I’m sorry, I made a mistake! or to try to brazen it out, hoping no-one will realise?"