Armstrong Whitworth A.W.52
The Armstrong Whitworth A.W.52 was an early flying wing aircraft designed and produced by British aircraft manufacturer Armstrong Whitworth Aircraft. The A.W.52 emerged from wartime research into the laminar flow airfoil, which indicated that, in combination with the flying wing configuration, such an aircraft could be dramatically more efficient than traditional designs.
Source: Wikipedia — Armstrong Whitworth A.W.52 (CC BY-SA 4.0)