This is the ongoing service honoring the deceased and now recognizing his inheritor. Quite dramatic and seriously consistent and providing real comfort as the reality of the afterlife is understood by all.
This whole tradition has been completely lost, but clearly has real validity and could well be adopted again with good conscience. Of course it was lost and even suppressed with the destruction of the Alexandrian library which explains why so much is intact here. The Kolbrin material was actively maintained there until around the fifth century AD.
Thus migration to Glastonbury is very credible. We are talking of a few centuries of monks maintaining a tradition and protecting it from mere archiving as would be expected from the Vatican.... .