In 1929, as well as T Roberts and sons Roby House, 114 Mostyn Street, there was a Lloyd Roberts at 27 Lloyd street; the Proprietor was a Miss Lloyd Roberts. Also listed as Grocers are F.W Roberts, P.O. 19 Ty Gwyn Road, Owen Henry Roberts in Alexandra Road, and a Wholesaler John Thomas Roberts at Bryn-Bras, Claremont Road.
My own grandfather David Price Roberts had the grocers at the corner of Oxford and Howard Road (later Plants) in the 1930's!