Seems to be a long time since you posted, so I am afraid I may have missed the boat.
I have Richard Glascodine b Bristol 1817 m 1839 Harriot Simons b 1815 Pembrey. Richard was Secretary to the Llanelly Railway. 4 children Richard William 1841 Charles Henry 1842 Louisa Mary 1843 and Edward John 1845. I have more info on all.
Looks like your Henry died 1897, coroner's report exists (not that I've seen it). I think the best next step might be to get your Henry's birth cert which would establish who his parents were.
Do let me know if I can help further...