pillar box design saw out the reign and remained little changed until 1905, when the basic design was refined. The Edward VII boxes now had the posting aperture as part of the door, rather than the body of the box. That eliminated the chance for mail to get caught up in the top of the box. This basic design remains the same today, having served well throughout the reigns of George V, Edward VIII, George VI and Elizabeth II. An experiment of 1932 was the addition of a stamp vending machine to the end of the post box. This necessitated an oval planform for the box even though it was only provided with a single posting aperture. At one end of the oval is the stamp machine and at the other is the posting aperture. The boxes have two doors; one for clearance of mail and one for emptying the cash and reloading the stamp machines. The machines were set to vend two halfpenny stamps in exchange for one old penny, the stamps being supplied in a long continuously wound roll known as a coil. Boxes were again made in two sizes, designated Type D and Type E, and carried raised lettering on the castings indicating the position of the stamp vending machine, as well as an array of small enamel plates warning users of the danger of bent coins and the need to wait for stamps to be issued before inserting more money. Several of each have survived in use in England and in the Isle of Man. Air mail Commercial Air Mail service commenced in the United Kingdom in 1919. By the early 1930s Imperial Airways was operating regular airmail services to Europe and the British colonies and dominions. To facilitate easy collection of air mail and its speedy onward transmission, a fleet of special vehicles and dedicated postboxes were introduced. To distinguish them from regular post boxes, they were painted Air Force blue, with prominent royal blue signage. The service ran successfully until the outbreak of war in 1939, when it was suspended. Although Air Mail re-commenced after the War, the postboxes and vehicles were no longer identifiable, as Air Mail could now be posted anywhere. Ireland Following the creation of the Irish Free State in 1922, almost all United Kingdom-era pillar boxes and wall boxes were retained, but painted green. Hundreds of these are extant around