You can try looking at AIR 14/3460. This file has aircraft damaged by the enemy, etc, fighter, flak. They sometimes give letter/serial here. Combat reports is another. You are not going to get all but you may find a few. This Squadron is a thorn in my side as they do not start showing aircraft serials till July 1944. I know they flew the Lanc VI on sorties but one cannot find which letter they may have been.