Harry Andrews ... Senior Civil Servant
Michael Caine ... Squadron Leader Canfield
Trevor Howard ... Air Vice Marshal Keith Park
Curd Jürgens ... Baron von Richter (as Curt Jurgens)
Ian McShane ... Sgt. Pilot Andy
Kenneth More ... Group Capt. Baker
Laurence Olivier ... Air Chief Marshal Sir Hugh Dowding
Nigel Patrick ... Group Capt. Hope
Christopher Plummer ... Squadron Leader Colin Harvey
Michael Redgrave ... Air Vice Marshal Evill
Ralph Richardson ... Sir David Kelly - British Minister to Switzerland
Robert Shaw ... Squadron Leader Skipper
Patrick Wymark ... Air Vice Marshal Trafford Leigh-Mallory
Susannah York ... Section Officer Maggie Harvey
Michael Bates ... Warrant Officer Warwick
Robert Flemyng ... Wing Cmdr. Willoughby
Isla Blair ... Mrs. Andy
Barry Foster ... Squadron Leader Edwards
JJohn Baskcomb ... Farmer (as John Bascomb)
Edward Fox ... Pilot Officer Archie