Philip sat on the board of The Charles Parker Archive up to shortly before his death, so I would have thought that was the natural place for them to be housed. He and his wife lived in Passage West in the south of Ireland.
Doc Rowe was a close friend of his and I know he had working knowledge of his films - not so long ago he said he would find out about them for me but he's obviously been too busy - he is now based in York
Another possible place for copies to have been deposited is Ruskin College in Oxford - that's where the MacColl and Seeger archive is housed - both were involved in the making of several of Philip's films.
Jim Carroll