More likely to have been displaying at Old Warden quite recently?
I agree. A camoflage finish and those peculiar roundels; come on. It would have started off with orange bands on the wings and fuselage and later, when I flew it at Tern Hill in early 1961, dayglow strips.
I went back to Tern Hill a few years later and found myself with a handfull of Leonides again; this time in a Sycamore helicopter. The difference with the engine was the use of Manifold Air Pressure instead of Boost. MAP started at 15 inches; boost at Zero. 2 inches equalled 1 lb of boost so 31 inches was the same as 8 lbs of Boost.
Piston Provost.
Emergency T/O 8 lbs Boost
Take off 4.5 lbs
Cruise 0 lbs
Bristol Sycamore
Lift into hover 31 ins MAP
Hover 30 ins
Hover taxiing 30/31 ins
Transition and initial climb 31 ins plus rotor droop.
Cruise 24 ins
Surprisingly they both cruised at the same speed; 120 knots.