One of my recent research projects identified that the remains of some of the airmen from one aircraft had been buried in a collective grave along with the remains of airmen from six other aircraft.
One other thing of interest was that although the plot was numbered 1-20, it contained the remains of 25 personnel, each with their own individual headstone. The CWGC sent me an explanation, which I feel is too sensitive to publish here.
Regards
Pete