From the most recent College of Arms Newsletter: A grant of Arms was made by Letters Patent of Garter and Clarenceux Kings of Arms dated 14 October 2016 to George STACK, Archbishop of the Roman Catholic Archdiocese of Cardiff.
College reference: Grants 179/343. The blazon reads:
“Arms (illustrated below): Vert a Pall parted and fretted each piece Argent voided Azure between in chief a Fleur-de-lys Argent in the dexter a Garb and in the sinister a Stag’s Head caboshed a Crescent between the attires Or.”
EXARANDORUM 
The good archbishop was explaining the meaning of parts of these arms to me the other day. Green for the emerald isle, and the green valleys of Wales. The pall for an archbishop, but also the three rivers that have featured in his life. A haystack for Stack, and a fleur de lys for our Lady … obviously there was more, but that was all that I can remember at present. I thought you’d want to know …