Thank you Slowhands, I think you have solved my problem.

There is indeed an Emma Jones baptised 31 July 1836 transcribed on the members website.

Parents Surname JONES
Child Forename(s) Emma
Father's Forename(s) [not stated]
Mother's Forename(s) Eliza
Mother's Surname
Place of Residence Alvington
Occupation [not stated]
Officiating Minister C. Bryan
Register Reference P12 IN 1/4
Page No 28
Parish/Chapel Alvington
Soundex J520

Looking at the 1841 census there is the following family,

William Williams 20
Elizabeth 20
Elizabeth 1
Emma Jones 4

Woolastone; County: Gloucestershire; Enumeration District: 9; Folio: 21; Page: 17; Line: 25; GSU roll: 288780.

Thank you again

Helen Phillips