There is something I do not understand here.
According to different sources, Reg Parnell built his Challenger in 1939, had a tubular chassis and a straight-six dohc engine.
It ran with an ERA engine in 1939 and a Delage eight in 1947.
"He also began the construction of his own car for voiturette racing (the pre-war version of Formula Two). Known as the Challenger, it was to feature a specially constructed, twin-stage super-charged, six-cylinder, 1.5-litre engine, double-wishbone front suspension, and torsion bars coupled with a de Dion axle at the rear; however, World War 2 intervened.
Parnell spent the war years completing the Challenger (but using a straight-eight Delage engine in place of the partially completed, home-brewed six) (...)."
I don't think it's the same car and I'd like to know more.
(BTW I don't think the current restorer\owner should be featured in the title unless he actually rebuilt it as something different)