Hi Caroline,
This is a list of all the possibilities.
GRIFFITHS, Thomas, ld, u, 19, iron miner, BRE Llanelly, Pwll-y-cwm, 90/f589/p30
GRIFFITHS, Thomas, ld, u, 21, labourer, WLS (N), Beaufort , 90/f304/p32
GRIFFITHS, Thomas, ld, u, 21, miner, BRE, Beaufort, 90/f249/p35
GRIFFITHS, Thomas, ld, u, 23, iron miner, CGN, Curzon Street, 90/f461/p9
GRIFFITHS, Thomas, s, u, 19, iron miner, RAD Llaneyeri, Phillips Row 2, 90/f120/p16
GRIFFITHS, Thomas, s, u, 20, ironworks labourer , BRE Crickhowell, Cheltenham Street, 90/f599/p10
GRIFFITHS, Thomas, s, u, 23, labourer, CMN, Beaufort, 90/f245/p27
If you want any further information on any of them let me know.
Juliepen