Unfortunately prior to that survey many headstones had been removed and stacked randomly against the south wall of the churchyard . I remember there being a reasonable number in that south eastern area where there are now very few , the vase that marks my grandparents' grave being one of them
My guess is that the relocation (or desecration depending on your point of view ) took place in the early 70s
Last time I was in the Churchyard there were still stones near the wall but they had deteriorated to such an extent that few were readable