« Reply #5 on: Sunday 24 January 10 11:03 GMT (UK) »
Do you have Sarah with her family on the 1911 census? The number of years married may help you work out her parents' marriage unless their first names are also really common.
The only birth registration for a Sarah E Jones around the right time and in the right district for Burry Port looks to be
Sarah Enid E Jones march qtr 1909 Llanelly vol 11a pg 1287
There are no plain Sarahs without middle initial
You could ask the registrar if the father on this birth record matches the father's name on the marriage cert you have
registrarsatcarmarthenshire.gov.uk replacing at with @
The volume and page number won't mean anything to the registrar but you can tie it down to the 3 months of the quarter.
Cornwall: Allen, Bevan, Bosisto, Carnpezzack, Donithorn, Huddy, James, Retallack, Russell, Vincent, Yeoman
Cards: Thomas (Llanbadarn Fawr)
Glam: Bowler, Cram, Galloway, James, Thomas, Watkins
Lincs: Coupland, Cram
Mon: Cram, Gwyn, John, Philpot, Smart, Watkins
Pembs: Edwards (St. Dogmael's)
Yorks: Airey, Bowler, Elliott, Hare, Hewitt, Kellett, Kemp, Stephenson, Tebb