Just had an email from Charles Daniel saying that in his notes his grandmother’s maternal grandmother was a Crosby not a Cosby. That rules out the Stradbally Hall lead as it’s been the seat of the Cosby family since the reign of Edward VI. I also downloaded a PDF file of the book The Family of Poe by Sir Edmund Bewley published in 1906. It has some pedigrees of the Irish Poe Family, but couldn’t find anything that fitted an Elizabeth Poe being the daughter of a Sir William Poe and Mary Crosby/Cosby. Not sure where else to look now.