Hi - I have the transcripts (from OFHS) for that church which according to the introduction is - to the north of Oxford city centre outside the city walls at the convergence of the Woodstock and Banbury Roads.
The original registers would be in the Oxfordshire Records Office - which I think is now at Cowley, however the transcripts produced by that society are usually very good and I don't think there will be much of value in the originals that is not on the transcripts.
The Baptism you quote is there with the additional interesting info that William (the father) is a grocer.
There are also baptisms for siblings
1823 Elizabeth
1825 Henry William
1826 John Edwin
1828 Richard
1829 Jane
The last three also have the information that William lives 'near the church' and the last one the really valuable info that mother Elizabeth was 'late Hammond sp' - in other words her maiden name was Hammond

DebbieG