I've found a Thomas Phillip in 1841 whose occupation I think is Hostler - what do you think? I'll try to post up a link:
ancestry 1841
Cwmgelly Cottages, Llangefelach, Glamorgan
Thomas Phillip 35 Hostler N
Mary Do 40 Y
David Do 15 Collier N
Rachel Do 13 Y
William Do 12 Hoslier Y
John Do 10 Do Y
Susannah Do 7 Y
Thomas Do 5 Y
Maria Do 3 Y
There is a likely for Rachel in 1851 as a servant in Aberdare, but I'll see if I can find this Thomas and the rest of his family in 1851 to see if the occupation is clearer.