terrier: "Wasn't the Custom House known as Ma Boyles, or has my memory failed me altogether?"

The Custom House wasn't. In fact Ma Boyle's is down behind St Nick's church near the Pier Head. What's now puzzling me is that the Poste House in Cumberland Street used to be a session venue, and it had a nickname similar to Ma Boyle's. Could it have been Mabel's, and was that where Mabel's Ceilidh Band took its name?