Thanks Lizzie. Enjoy your trip to Llantillio Crossenny. In case you need to know, there is no pub in the village now (for lunch) but I can recommend one (can't remember the name!) on the Monmouth road going east from Llantillio, on the left after about 1 - 1.5 miles. My family were also in the Merthyr area, including Aberdare, also Brecon and Newport.
Griff