One of the pleasures of fiction, be it book or film, is that it can take us to actual places beyond our own national boundaries – and into other worlds which don’t exist. Think of fictional states from Narnia to (Graham) Greeneland – and Richard Curtis’ London, that parallel version of our capital seen in Four Weddings and a Funeral, Notting Hill and Love Actually, where no one has ever seen a machete and swearing is only ever done in a jolly way.