SpitLip's award-winning show, based on an audacious episode of wartime espionage, takes over from The Woman in Black at the Fortune theatre 'It feels completely unbelievable. And, also, like the cumulation of everything we've been working towards for all these years," says Natasha Hodgson, who along with Zoe Roberts, David Cumming and Felix Hagan make up theatre company SpitLip. They all seem dazed and delighted by t…