Airmen shelter from the sun at what was then RAF Heliopolis. K4067 went to fight in World War II. It was damaged by Italian anti-aircraft fire at Metemma, Ethiopia, on January 6, 1941. Wrecked in the ensuing forced landing at Doka, Sudan.

'RAF activities against Arab rebellion.' The Hardy was a Hart variant equipped for such colonial 'air policing' duties. K4308 was lost in an Italian air attack in the Sudan on 12 December 1940. On the right here is a Vickers Valentia. Photo from: Library of Congress

Photo via Colin Howarth. The crew appears to be demonstrating an enhanced aerial, with a cable running from the aircraft's radio compartment to a wire stretched from a link on the upper wing to a point outside the photo.