Book excerpt: A New Statesman Book of the Year London. A city apart. Inimitable. Or so it once seemed. Spiralling from the outer limits of the Overground to the pinnacle of the Shard, Iain Sinclair encounters a metropolis stretched beyond recognition. The vestiges of secret tunnels, the ghosts of saints and lost poets lie buried by developments, the cycling revolution and Brexit. An electrifying final odyssey, The Last London is an unforgettable vision of the Big Smoke before it disappears into the air of memory.