'Flit' was an Allied one of several exercises undertaken in the UK to investigate and develop the concepts required for a descent on German-occupied France (summer and autumn 1943).

'Flit' involved the headquarters of Lieutenant General H. D. G. Crerar’s Canadian 1^st Army and Air Vice Marshal L. O. Brown’s No. 84 Group of the RAF, and took place at Box Hill, near Dorking in Surrey, to practise the establishment and operation in the field of an integrated air and ground command system (5/11 May 1943).