so Sarah E née Lambourn on the 1891 with her parents in Ensham is the Jane on the 1901 ?What kind of problem would make a marriage entry disappear?
Many instances of problems / omissions in the long winded process of manually copying returns into a Local District Registers and then quarterly replicating to the central GRO, who in turn prepared a new set of registers for the whole country.
Somebody wrote a book about it called 'A comedy of errors'
Ref 1881 - yes, saw that. Slightly different POB for Henry / Harry?
Added: If Harry is born Eynsham as shown 1881 census - where Mum is Elizabeth from Staffs (c1861) - and Ms Lambourn is from Ensham too & in 1891 calls herself Sarah E (c1861), apart from the age difference could this be the same person?
I suspect the age of 'Jane' in 1901 is wrong !In 1871 she's called Sarah E - so where does 'Jane fit in' ??
Ah, there is a younger sister Jane back in 1881.
No Sarahs, but a couple of Elizabeths die in West Ham District in 1899/1900 of the right sort of age.