RAF code "BI" in WW2?

[Parabellum]

Originally Posted by Alex Smart

The photo does seem to me to show a "2" rather than a "1".

Alex,

492, that's what I said in #5 and, after close exam of the photo I would say that we can too discern the dark hue of the diagonal stroke of one cipher 7 , just under the right foot of the guy sitting in the foreground (close to the separation between the upside camouflage painting and the underside painting).
Regarding St Valéry, could you possibly state me the exact location of the target: St Valéry-sur-Somme? St Valéry, near Osmoy-St Valéry?
Beside that, do you know the individual code letter for P4927 ?

Regards,

Michel.