Gentlemen in Blue is history of No.600 (City of London) Squadron, Royal Auxiliary Air Force. Formed on 14 October, 1925, it was made up of men who worked in the City, who had an interest in the aviation and who were further moved by a drive to serve their country. Under their first and probably best know commanding officer, the Rt. Hon. Freddie Guest, MP, these Auxiliaries, who trained only at weekends, achieved a standard of efficiency which was the envy of other 'regular' RAF Squadrons.
Formed as a bomber squadron, No.600 became a night-fighter squadron in 1940, equipped with obsolete Blenheins, of which an entire flight was lost over Holand on the night of 10 May, 1940. Later in the Second World War the Squadron served in North Africa, Malta and Italy, becoming the highest-scoring Allied night-fighter squadron of the war, by then flying in Beaufighters and Mosquitos and referred to by the enemy as 'The Fright of the Night'.
Disbanded in 1945, it war reformed a year later under Squadron Leader-Hayes to become once again, flying in Spitfires and Gloster Meteors until it was finally disbanded in 1957.