No luck in Boddy's book about the track, but I've eventually found a website which tells me it is André Le Jamtel in an 1100 Amilcar called Dergi-Special, on 24/04/1949 and it won its class and was third overall.
If that's true I cannot say, but I found nowt else except that in 1948 Le Jamtel's car was called Amilcar-Dauphine - might be the same car, but I can't say.