Royal Observer Corps
In 1929 the control of the Observer Corps passed from the county police forces to the Air Ministry, although Chief Constables retained responsibility for personnel and recruitment matters. 1 March 1929 saw the establishment of the new "Headquarters of the Observer Corps" at Hillingdon House, RAF Uxbridge in the west of London, and Air Commodore Edward A D Masterman CB CMG CBE AFC RAF (Rtd) was appointed as the first commandant of the Observer Corps. "Air Cdre" Masterman held this appointment until his retirement on 1 March 1936, and was succeeded by Air Commodore Alfred Warrington-Morris CG CMG OBE AFC RAF (Rtd), who would lead the Observer Corps through the critical period during the Second World War which saw the RAF emerge bruised but victorious following the Battle of Britain of 1940.
Royal Observer Corps
Perhaps the most unusual ROC post location was No.17 Group (Watford) Easy-4 Windsor Post, nestling between the battlements and chimneys on the top of Windsor Castle's Brunswick Tower. Reporting for duty through the castle gates, many newly appointed ROC Group Officers were caught unawares when the castle Guardsmen in their sentry boxes snapped smartly to attention and presented arms. Observers frequently encountered King George VI, Queen Elizabeth and the Royal Princesses, (Princess Elizabeth and Princess Margaret), in the castle grounds, where they would often make a point of stopping to enquire as to ROC activities.