 During the early 1960s, aircraft development became increasingly expensive, with the result that major projects often became mired in political and economic concerns. The development of TSR-2 saw increasing cost overruns, combined with the presence of a potentially cheaper alternative then under development in the United States, the F-111. The P.1154 was subject to the ongoing inter-service rivalry between the Royal Navy and RAF, which led to two wildly differing specifications being submitted for the aircraft that were impossible to fit within a single airframe.
