  Last week, as I tramped happily around in the snow, it occurred to me that in The Lion The Witch And The Wardrobe, CS Lewis created Narnia as a methaphor for Clissold Park in Stoke Newington. The gap in the fence on Church Street is the magical entrance to this world, certainly after pub closing time at any rate. Aslan the Lion represents the old bowling green.  It's got old lamp posts, deer, an old house.  Did CS Lewis spend a lot of time in Stoke Newington and are any of his other books about the area? A Horse and His Boy could be about the Lea Valley Riding School. Prince Caspian surely refers to that gastropub on Kynaston Road. The Last Battle might be a sly comment about the anti-bendy bus movement on Church Street.
Maybe this theory needs a bit more work.