Thank you for the point. I found the car by chance, like most members of AP, whilst looking for another car with a Rochdale body. I cannot find any images of the car online, and took a guess.
The car was registered KRO548 and was built by a Dr. Kennedy using a Lancia Augusta chassis and an MG TC engine of 1250cc which was later bored-out to 1460cc. It originally had a body built by Harry Lester, which I guess may have been a cycle-winged affair. The car must have been built in the late 1940s, because in 1950 it was bought by Roy Croysdell. It later passed to Alex MacMillan, who rebodied the car using an alloy body from Rochdale Panels, which is the one in the puzzle photo. They later sold the car for him after he had bought an Elva chassis, which he bodied in a Rochdale Type F (this has been a previous AP puzzle.)
The car is named Lamgia because it is a Lancia chassis with an MG engine.
(No wonder I couldn't remember any Lancia-engined competition cars of the 50s in the UK!)