If you’re into office supplies (admit it—it’s time to come out of the supply closet), the ubiquitous chain, which makes an appearance on almost every busy U.K. shopping street, is a good place to stock up on hard-to-find English-size A4 paper, clamp binders (not common in the U.S.), and convenient “box files” (also absent from other countries’ stationers), available in a spectrum of sprightly colors.