THE BATTLE OF BRITAIN 1940 (CH 740) Spitfires of No. 610 Squadron, based at Biggin Hill, flying in ‘vic’ formation, 24 July 1940. N3289 DW-K and R6595 DW-O nearest. Copyright: © IWM. Original Source: http://www.iwm.org.uk/collections/item/object/205193352