So far I can't find a marriage for a John/James to Jane prior to 1839.
Births Jun 1852
Love Jane St George in the East 1c 394
Love Jane Eliza Stepney 1c 511
I can't find a baptism for Jane - father should be George.
This is probably Jane in 1891:
name: Jane E Sadler
event date: 1891
relationship to head of household: Wife
birthplace: Islington, London
record type: Household
registration district: Holborn
sub-district: St James Clerkenwell
ecclesiastical parish: St James
civil parish: Clerkenwell
county: London, Middlesex