1938/46 Rover Special

I remember seeing this car competing many times at VSCC meetings at Oulton Park in the 1950s and 60s, but this photograph taken at the 1973 Richard Seaman Memorial Trophies meeting appears to be the only one I have of it.

It's the 1938/46 Rover Special of Frank Lockhart which was built in 1948 by three young engineers at the Rover Company using a chassis which was a prototype of the P3 chassis designed by Adrian Lombard in 1938. They and other drivers used it for club racing but in 1963 Frank Lockhart became the regular driver and in the late 1960s he bought the car from the original owners. The car has been powered by several different Rover engines and in 1973 the car had a 2,995cc engine, seemingly the 6-cylinder inline unit from the Rover P5.