If Westminster Abbey were in almost any other place in the world, it would rightly be the focus of every tourist’s smartphone camera. It is, after all, one of the world’s greatest churches, a Gothic masterpiece with a history stretching back more than a millennia. Yet the Collegiate Church of St Peter, Westminster (to give it its formal title) sits across Abingdon Street from the Houses of Parliament, so it finds itself both literally and metaphorically in the shadow of Big Ben.