Sue and Chris.
I am certain that the 1911 census record does not say Cardiff. That looks like a mistranscription. The word definitely starts CA and ends LIFF with 2 letters between. What do others think please?
Also there is no doubt that in 1855 the village of Catcliffe,as Sue has said, was in the Ecclesiastical district of Wales. The village is still there about 6 miles east of Sheffield centre.
As far as I know the 1911 census return form was provided beforehand to each address and the household completed it. Therefore presumably Willie himself wrote it, not the enumerater. So it cannot be a mishearing by the enumerator.
What is his birth address as recorded on his birth cert?
Dave