Lancaster lost over France 1944

Hi folks, I am new to this forum so please bear with me if I make a mistake.
My uncle William Longmore was mid-upper gunner in Lancaster X KB755 which was shot down at Auberville la Renault, about 18miles NE of Le Harve on the night of 7/8th August 1944. All seven crew members died and are buried in the above village churchyard. Where can I find info on the German fighter, the pilot and the squadron that operated in that area at that time and where would they have taken off from? I would be very grateful for any information.
Bill