Thanks one and all for your thoughts and searches.
As you say Hugh was born before civil registration as were all his apparent siblings. So no help there. He
was born in Gyffin as per the census returns as you have found, Hugo. The reason I have previously discounted the Moses you suggest is that the Free Reg site baptismal files suggest Moses and Ann had the following children Hugh bn abt 1797, John bn abt 1798, Mary bn abt 1800, Hugh bn abt 1802, Elizabeth bn abt 1803, Hugh bn abt 1806 (Mine), Ellin bn abt 1809 and Ann bn abt 1815 and felt Moses wasn't old enough but I suppose looking back, he was just about, particularly if you take into account age discrepency built in to the 1841 census.
FreeReg doesn't show a Richard JONES for Moses and Ann though I know not all files are complete etc. Mind you his apparent age would fit in nicely as the last of the siblings. Moses was listed as an Ag. Lab on the 1841 census and a miner on Hugh's marriage cert. I know that ag lab supplemented their income down the mines and presumably as folk got old would have found land work easier than mining so can't exclude on that account. I think I felt generally, the data didn't fit in quite well enough to take him as my Moses. Only being able to research via the net means I am a little cagey at claiming them as mine.
Been so long formulating my reply that I've only just seen your additional post , Hugo re Moses' burial. I must admit that the more background you folk offer up, the more I wonder if he is my Moses. Don't know if I said but strangely I have another Moses JONES on another Welsh branch of my tree!! Not from Gyffin though
I'll visit that posting, thanks