Delayed by the late delivery of its propeller, the first prototype was rolled out at Brough in February 1947 and then taken by road to RAF Leconfield where it made its maiden flight on 1 April that year. All three prototypes were completed by the end of September 1947 and the third prototype had been modified to reduce the outer-wing dihedral to 3°. Both the second and third prototypes remained unflown when the Ministry of Supply ordered that flying be ceased and work on the aircraft be stopped. Later in the month, however, the third prototype was allocated to tests of powered aileron controls, as testing of the first prototype had shown that while adequate at cruise speed, the ailerons were heavy both at low and high speed. The second prototype was allocated to structural testing.