Number 1 almost certainly has a Dutch license plate. This type was in use until 1950, and allowed until 1956/7. A quick look in my database does not show an obvious candidate, and this particular number has not been seen by me before.
Just pre-war should be a possibility too, unless you know for certain that it is post-war. Several Dutch drivers raced in France in those days, and it is clearly a modified MG.
My guess would be to look to Hans / Harry Herkuleyns. The other MG user was Eddie Hertzberger, but that would have been a South-Holland registration (H or HZ), and I think he stopped racing after the raid on Rotterdam (1940) destroyed most of his possessions.
Herkuleyns I have on MG K3 -K3031. A picture in the book K3 Dossier shows a similar body on K3031 (and no Belgian girl singers), so I think I am on the right track.
Edited by Henk Vasmel, 09 October 2021 - 19:53.