Ooops just realised you likely have 1911 Census and its 1901 for William you need. He wont be married then as marriage was reg last qtr of 1901.
There is a possible 1904 Marriage on FreeBMD Swansea;
Rebecca JONES/Thomas DUNCAN on same page
May be a long shot but 1901 Census has a William SMITH born c 1876 Barnstaple, Devon, Dock Labourer, Single, living in Swansea.
Trish
