 540 Squadron RAF from RAF Benson, Oxfordshire.The photographs were sent for assessment to the Central Interpretation Unit at Danesfield House, a 'large pseudo-Tudor mansion' near Medmenham, Buckinghamshire, from Benson.At the beginning of June 1943, Squadron Leader Claude Wavell, head of G Section (Radar & Radio) at Medmenham, noticed stacks of ribbed metalwork lying outside the relocated Zeppelin shed in recent 'covers' of Friedrichshafen.