Both sides scramble as Brexit vote grows near. London 鈥 A huddle of volunteers surrounds Robin Phelps at his table in the Imperial Durbar, a pub located in the middle-class Tooting neighborhood. Phelps, a volunteer coordinator for the 鈥淩emain鈥 campaign, directs his charges to neighborhood 鈥渟ectors,鈥 where they鈥檒l make a...