Heston Aircraft built two prototypes, the first, serial VL529, first flew in August 1947.

The JC.6 was an all-metal cantilever monoplane with twin booms and two vertical tail surfaces joined by a single horizontal tailplane.

It was powered by a rear-mounted de Havilland Gipsy Queen six-cylinder aero engine fitted between the twin booms and driving a pusher propeller.

The two-seat tandem cockpit was covered with a large glazed canopy.

[1] A floatplane version was designed by Saunders-Roe as the Saro P.100, but was not built.