Please bear with me - information is very scarce. I have found out that it is pre-WW2, and was originally a sports car based on an MG TC, converted post-war to a monoposto, with Lancia front end and wheels, and Chevrolet truck drive shafts (!). The history of the car says that it had a Lea-Francis supercharged engine, but the entry list for the 1952 Australian GP states engine is Frazer Nash.
No actual year of build yet....