So begins The Lion, The Witch and The Wardrobe, the first of C S Lewis’ seven Chronicles of Narnia ending with The Last Battle in which Aslan creates the Real Narnia, and the four children pass into it to live for eternity in happiness. Except they don’t – because one of them, Susan Pevensie, isn’t allowed. When she first went through the wardrobe, Susan was 12. Now it’s 1967, and Susan is 39… Just before Christmas…