The prime minister's "red box," looking rather lonely, on a train Saturday from London to York. The Mirror made it front page news. The Mirror hide caption itoggle caption The Mirror The Two-Way Downing St. Denies 'Dozy' David Cameron Left Secrets Unguarded September 9, 2013 The prime minister took a train from London to York on Saturday, and a passenger says Cameron left his "red box" unattended for a time. It's one of the traditional briefcases that British officials use to carry papers. Cameron's office, though, says security personnel were always near.