Dag Luc,
For Res. Flak Abt. 266 I think this is the one:
https://www.ww2.dk/ground/flak/abt/gem266.html. Units in the Calais region in 1942.
It appears indeed that Lancaster L7571 was the one down at Beerst instead of the Wellington given the testimonies of the captured crew.
What's lacking however are local histories so far.....
Groet,
Leendert