The story
Air-Britain was formed in 1948 as an amateur association of aviation enthusiasts. In April 1968, it was incorporated into a company limited by guarantee, Air-Britain (Historians) Ltd. On 16 April 2015, the status of Air-Britain changed from a Private company limited by guarantee, in the form of Air-Britain (Historians) Ltd, to a British charity, in the form of The Air-Britain Trust Ltd.
Air-Britain organised an annual international aircraft recognition contest that started with an event in September 1961, for all-comers, and attracted applications from individuals and teams from various sources such as Royal Observer Corps (ROC), Air Training Corps (ATC), and Air-Britain regional branches. The annual aircraft recognition contest was discontinued after the 48th event held at the Royal Air Force Museum London on 21 November 2009.
From Wikipedia’s article on Air-Britain, shared under CC BY-SA 4.0.3