This appears to be the second Marriage in the FMP Search Index, that you refer to-
Civil Registration event: Marriage
Print Close Name: JULIAN,Thomas Registration district: Kings Norton County: Worcestershire Year of registration: 1853 Quarter of registration: Jan-Feb-Mar Spouse's last name: Not available before 1912 Volume no: 6C Page no: 469 MarriageFinder:Thomas Julian married one of the following people:
I have tried to find the JULIAN couple in the 1861 & 1871 UK Censuses without result; and also searched those Censuses for any JULIAN child born between 1851 & 1871, with separately either THOMAS or MARY present, again without success.
So I resorted to try to find her in the 1841 Census as Mary JOHN, with a JOHN JOHN present, in MONMOUTSHIRE-
Household JOHN, Mary 1816 25 F Cardiff Monmouthshire VIEW VIEW Household JOHN, Mary 1821 20 F Abergavenny Monmouthshire VIEW VIEW Household JOHN, Mary 1833 8 F Abergavenny Monmouthshire VIEW
Doing a similar Search in Glamorganshire (just in case) produces about 40 results.
Have you any later information for any of them, eg Age at Death etc?