Well that's the second Beckenham Special.
The engine is an MG 18/80 Mk III (Tigress) and I think the chassis was also MG 18/80 shortened. The front suspension is Lancia Lambda 7th series. The back axle was Ford V8, but with reduced track.
The supposed date of construction is 1939 and a lot of what I know comes from Motor Sport, January 1943, where the constructor, K. Salmon, wrote up what he did