More research into William Phillips has revealed a few possibles, and several Philips families in the village of Nelson at around 1901 and 1911. With the release of recent data, I have ruled out all but one person. I would still like some confirmation from any family member who could confirm that this is the right person.

William R Phillips, born about 1891 in Nelson - in 1911 he was living at 12 Suzannah Place, Treharris, in the home of John and Mary Davies. Also living at the address was Evan John Phillips, 26yrs.
William is shown as a coal miner - hewer at the Ocean Colliery, Treharris , which later became known as the Deep Navigation Colliery. Evan was William’s older brother.

John Davies and Evan Phillips were shown as employees of the Great Western Railway, and Suzannah Place, Treharris is just below the railway embankment that carried Great Western Railway trains from the Aberdare line into Treharris Station.

William was one of at least four children to Evan and Margaret Phillips who lived at 53 High Street, Nelson. Their other children were:

Evans John, b. 1885 in Breconshire
David J., b. 1887 in Nelson
Mary A., b. 1889 in Nelson, and,
Collwyn, b. 1900 in Nelson.

Evan Phillips Snr and Jnr, as well as David Phillips were coal miners in 1901.