Gareth,
Could be, although I don't live in Rhymney, I live in Ohio. The two great great uncles I mentioned were brothers of my great grandmother Alice Williams (nee Gower). She and my great grandfather were married in Tredegar in 1872.
Alice herself labored in the iron foundries as a teenager, bore 11 children, outlived 3 of them, and died at 77. I know that I must have relatives living in Wales, but I've not located any yet.
Great grandfather Lewis was a puddler, and most of my direct ancestors on my father's side were in the iron/steel mills. Hellish as they could be, they were miles ahead of working down the pits, which IMO has to be the worst exploitation and worst job ever.