The first production Heyford in its final form. It had been subject to tweaks during 1933 ahead of the type's service entry at the end of 1933. Photo from: Imperial War Museums

Delivered to No 99 Sqn at Upper Heyford in March 1934. This photo was published in Flight in May 1935. K3500 crashed near Colchester in May 1937. Photo from: San Diego Air & Space Museum

'The second production Handley Page Heyford I, K3490, of 99 Squadron under mock attack from a Hawker Fury [or Demon?] during an air gunnery training flight from Upper Heyford on 28 November 1933.' Photo from: Royal Air Force

Fighter at two o'clock! The Heyford's unusual configuration was chosen to improve the field of view for the gunners. 'Dustbin' ventral turret extended. Photo by: Edward Malindine / Daily Herald / National Science and Media Museum

'Rehearsal of the Royal Air Force Display at Hendon.' This early Heyford served with No 99 Squadron, appropriately, at Upper Heyford. K3497 crashed one week later on 6 July 1934, hitting a hedge when returning to base after a night exercise. Sgt Plt George Robinson lost his life. The aircraft was damaged beyond repair. Photo by: Edward Malindine / Daily Herald / National Science and Media Museum