 Part of the reason for the cancellation was the perception that by the time it would enter service, Soviet anti-aircraft capabilities would have improved to the point where it would not be able to succeed in its mission; a preference for missile development over manned aircraft was another factor.A successor high-speed bomber would be developed to meet Air Ministry Specification GOR.339, designated as the BAC TSR-2; however, this too would be eventually cancelled.Following the end of the Second World War and facing the threats of the newly emerging Cold War, the Royal Air Force (RAF) was keen to not only preserve but to strengthen its strategic capabilities.