Westland Lysander P.12

A one off, converted Lysnader "spy drooper" designed as an aerial machine gun platform ( 2 x .20 mm (0.787 in) Guns + 4 x 20 mm (0.787 in) Guns in rear turret) to strafe possible pesky German invading forces in 1940-41

http://ww2drawings.jexiste.fr/Files/2-Airplanes/Allies/3-UK/05-Reconnaissance/Westland-Lysander/Lysander-P.12.htm

http://www.unrealaircraft.com/hybrid/lysander.php