 The infamous 1957 Defence White Paper, described as "the biggest change in military policy ever made in normal times", led to the cancellation of almost all British manned fighter aircraft then in development, and completely curtailed any likelihood of a purchase.In January 1959, the UK's final answer was no; Britain countered with an offer to sell Canada the English Electric Lightning.The French government expressed an interest in the Iroquois engine for an enlarged version of the Dassault Mirage IV bomber, the Mirage IVB.