Dont think it is a french port.
The tricolour is actually the T flag with E beneath it TE meaning please pass me slowly. The Clan R astern has the same flag hoist.
I think it might be Southampton, almost certainly UK as no courtesy ensign is being flown and TE is always flown at Southampton.
my first trip to sea as catering boy dec 1970 till may 71 then she went for scrap and my next trip to sea was as a deck boy as i could not stand the hours in catering and prefered it on deck but it was a good first trip and on the way back from the cape we had tons of fresh fruit to eat
was on the old roxy my first trip as a catering boy joined southampton took her to shanghi for scrap on a runn job had some tractors on for cape town port elizebeth and durban 2 stwd was aneast london lad joth tarrennt into his greyhounds and speedway