Nov 11. I believe the rules were 7lb, hopefully to include the spinal cord and skull, but it was geared to the weight of a new born. It was intended that enough to identify one human be included, such as a skull, but obviously whether that applied in Occupied Territories or not I can't clarify.
As you say, it is not necessary to go into the finer points, but where a single seat aircraft was involved, whatever could be recovered was considered sufficient for a burial.
My question was whether what had been recovered from the Tempest crash had subsequently been taken back to Greece. I would have expected there to be enough for a burial. For him to be on Runnymede indicates either nothing substantial was recovered or that his remains are "elsewhere", hopefully in Greece with his family.