The British were setting up GEE-H stations on the continent from Sept; there were "check-points" along certain routes which would need linking with bomb-sights.
Looks like a triangular course which makes sense.
This is the 512th escort on the 25th. but unfortunately no further details.
Regards
Nick
http://www.atticaerospace.com/Digita...ry/Slide32.JPG