Second prototype and the first built in the UK, first flown at Filton, Bristol, on April 9, 1969. First supersonic flight was made on March 25, 1970, when Mach 1.15 (852.673 mph, 1372.244 kmh) was reached, while it reached a maximum speed of Mach 2.05 (1519.983 mph, 2446.175 kmh) on October 7, 1971. G-BSST made its last flight while delivered to Fleet Air Arm Museum at Yeovilton, Somerset, on March 4, 1976.

For supersonic flight a visor was raised forward of the windshield. To improve forward view during take-off and landing the entire nose section forward of the windshield was drooped. View also photo 7669.