I've seen this photo a number of times on Ebay and on Getty Images with the same caption.
It is labelled "Mystery Delahaye at the British Empire Trophy 1949
I can find no record of a "Delahaye" with racing number 55 in that event, or any other year. In fact no 55 at all.
Also, I far I can see, Douglas was an anti-clockwise circuit, and there the only tight corners are left-handers.
Can someone identify this car and circuit.