Hi
I'm coming rather late to this thread but I hope the following may help to establish Henry's birth place.
Using the Coast Guard Establishment Books I have traced William's service from his Nomination, in Dec 1831, with a first posting to Rosslare. On 2-9 July 1837 he was removed to Carnsore, and then on 4 July 1838 to Garrison Point in England. In December 1843 he was transferred to Cockleshell Hard, Kent.
Just out of interest during the Crimean War William was one of those CG's who volunteered for service in the Navy, with a posting to HMS Cressy. Unfortunately he must not have been up to the task - since he was over 50 I'm not surprised, so was discharged on 11 March 1854, and never saw active service.
Martin
Coastguards of Yesteryear.