Alun, you may have Howell in 1881...
1881 Wales Census - RG11/5321 F.13 P.20
29 Thomas St., Aberdare, Glamorgan, Wales
Howell Davies - Lodger - 20 - Labourer - b. Trelech, Carmarthenshire
And Mary is widowed...
1881 Wales Census - RG11/5401 F.49 P.2
Cwmtawel, Treleach-ar-Bettws, Carmarthenshire, Wales
Mary Davies - Head - Wid - 53 - Farmer of 6 Acres - b. Trelech Parish, Carmarthenshire
Daniel - Son - 15 - Farmer's Son - b. do
William - Son - 12 - Scholar - b. do
Benjamin - Son - 9 - Scholar - b. do
Regards,
John