Despite expensive enquiries I have not been able to determine the authenticity of this unusual paint job. Pima's site states that these are RAF test colours from 1961 at Dunsfold but I think it more likely that the colours were simply inherited from the previous private owner who had the aircraft painted like this, perhaps to look like an Indian Gnat/Ajeet. Pima's Head of Collections was very helpful in correspondence, but we were not able to resolve this question. What we do know is that the aircraft was used by the A&AEE, Bristol Siddeley Engines and the RAE before becoming a ground trainer.

This bright scheme is from the Royal Air Force flight test colors, 1961.