Thwarting Nazis In Ireland -- John Betjeman
That's what we know.
What Really Happened was Betjeman, with his knowledge of propaganda, was sent to Ireland to run a counter-intelligence ring against Ahnenerbe agents. The Ahnenerbe showed considerable interest in Ireland, due to the presence of both Norse/Ayran artifacts left from the Viking raids and the older relics of the Tuatha de Danann. Rumors persist of Ahnenerbe agents trying to summon Balor of the Evil Eye in an attempt to overrun Ireland and use it as a base for an invasion of England and to strike at trans-atlantic shipping.