Only on the 10th test flight was the landing gear successfully retracted—problems preventing this on previous occasions, but serious vibration problems on landing persisted throughout the flight testing programme. The first supersonic test flight (Flight 14) was achieved on the transfer from A&AEE, Boscombe Down, to BAC Warton. During the flight, the aircraft achieved Mach 1 on dry power only (supercruise). Following this, Beamont lit a single reheat unit as the other engine's reheat fuel pump was unserviceable, with the result that the aircraft accelerated away from the chase Lightning flown by Wing Commander James "Jimmy" Dell, who had to catch up using reheat on both engines. On flying the TSR-2 himself, Dell described the prototype as handling "like a big Lightning".