THE POLISH AIR FORCE IN BRITAIN, 1940-1947 (NAM 16) A loose formation of Supermarine Spitfire Mark VBs of No. 303 Polish Fighter Squadron (based at Heston, Middlesex) escorting Boeing B-17 carrying General Bernard Montgomery from Prestwick to Northolt on his return to Britain from North Africa, 17 May 1943. Copyright: © IWM. Original Source: http://www.iwm.org.uk/collections/item/object/205208079