Despite an increasingly paper-free world, London homes overflow with the stuff. Perhaps you use a bowl in your living room or a shoebox under your bed; communal residents share with housemates and upgrade to a space to match — a full drawer in the kitchen. Occasionally you’ll open it absent-mindedly looking for scissors, and unleash a torrent: takeaway menus, forgotten bills, crumpled receipts, perhaps an unexpected treat (a tax rebate! From 2008!). Amid the torrent floats the flotsam of café culture: tens of half-completed, tatty loyalty cards.