Numerous scenes were shot in the preserved operations rooms, illustrating the operation of the Dowding system that controlled the fighter squadrons. Much of this footage takes place in 11 Group's operations room, today preserved as the Battle of Britain Bunker. Other scenes take place in Fighter Command's central "filter room" as well as recreations of the squadron ops rooms. One scene shows the hit on Biggin Hill's ops room, and another shows its relocation to a local bakery, although this is a recreation of another squadron's backup room in a local butcher's shop.