Blue Postbox

This George V pillar box on Liverpool Road, Manchester.  Is distinctive because its blue rather than red. 

It is one of only two blue postboxes still in regular use in the UK; the other one being located outside Windsor Castle in Berkshire.

By the early 1930s regular airmail services were being operated to Europe and the British colonies and dominions. A fleet of special vehicles and dedicated postboxes were introduced for the collection of air mail; to distinguish them from regular post boxes, they were painted Air Force blue. The service ran until 1939.

This one was repainted blue (in 1983?). Presumably because it is situated outside the Air and Space Hall of the Museum of Science and Industry and so acts as a reminder of the pre-war air mail service