The puzzle image shows T. C. 'Cuth' Harrison and his wife Kath in one of Cuth's Harford Specials at the 10th R.A.C. Championship Trials in 1958. Harrison's car was powered by a Ford Ten engine, however, not a JAP. The only JAP-powered car at the event was the Bassinet of A. D. Alldred.
The Harford shown above was built by Harrison (who was a Ford dealer) on a Cannon Chassis, with Ford Ten engine, Ford steering, Austin Seven brakes and wheels, and various other Ford and Austin components.