[SteveR]

If you've got the track for the bomber stream and the direction of the turn off the target perhaps a rough determination of the location can be made.

From the F541 for LV819: "...with a bomb load consisting of 1 x 2000 lb. 5 x 1000 lb. and 6 x 500 lb. H.E's. (sic) which were released from a height of 17,500 feet at 19.41 hours."

So the combat took place 6 minutes after bombs gone. What course would they have taken off the target and how far away would they have been 6 minutes later?

Crew of LV819 as given in the F541:

F/S Stevens. E.G.(P)
Sgt Spratt. V.S.(N)
Sgt Whitmore. J.B.(B)
Sgt Gibbs. R.A.(W)
Sgt Pritchard. A.R.(E)
Sgt Yearsley. J.H.(MU/G)
Sgt Morgan. H.D.(R/G)

Maybe someone has a logbook from one of them that can shed more light on the location of the combat.