Remote-control helicopters in your hair, magicians at your elbow, rugrats at your knees. This high-octane toy store is run by a gaggle of cheerful young floor staff, themselves kids at heart, who giddily demonstrate the latest toys. The experience will send you into sensory overload. The seven floors are stuffed with amusements—the fifth floor is nothing but sweets. Depending when you go, there may be free pirate face painting, a caricaturist, or even a beach party. It’s one of the world’s few department stores devoted just to children, and the only must-see toy store in London—even if you don’t have kids with you.