I envision TSA-style stops at the border to London. Everyone will have their pocket knives, pens, and shoelaces removed before they can pass. Stage two will be the bubble wrap room, where each person will be wrapped in a state-standard minimum of 7 evenly distributed layers of bubble wrap, at which point they will be free to proceed to the tube (metro) where safety messages, "all is calm," and praise of all cultures but British will be blasted on loudspeakers in repetition as bomb sniffing dogs roam each passage along with police carrying nothing but the Koran and rainbow sparkle glitter to protect them.