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This aircraft was originally the second prototype Mk.1 and was registered G-AGST to the MoS&AP. Subsequently it was modified to a Mk.4 by a 5 ft 9 in (1.75 m) stretch of the fuselage and fitting the 1,760 hp Rolls-Royce Merlin Mk.623 liquid-cooled twelve-cylinder V-engines. The aircraft was transferred to the MoS and converted to the sole Mk.8, serialed VX195. The Merlin negines were replaced by four 5.000 lb (2.268 kg) s.t Roll-Royce Nene Mk.5 engines in paired nacelles under the wings. In this configuration it was flown for the first time on September 6, 1948 and used for high-altitude investigations. Withdrawn from use it was broken up at Farnborough in 1951.