The free 1911 census indexes show a Constance Kate Webb living in Cardiff, age 31.
Is this her?
If this is indeed her, marrying at the age of 34, I have to ask: was she married before?
What does it say on the marriage certificate?
1901 census: Reference RG13, Piece 4978, Folio 154, Page 45
70 Salisbury Road, St John the Baptist, Cardiff
Webb, John Head M 49 Tram Conductor b Ledbury, Herefordshire
Webb, Eliza Wife F 48
Webb, Herbert Son M 24 Greengrocer
Webb, Constance K Daughter F 21 Greengrocer
Webb, Minnie/Mina(?) Daughter F 17
Webb, Evan Son M Railway Employee
Webb, Hilda A Daughter F 11 (all born Ledbury)