I only have the transcripts from the Oxford FHS for Abingdon St.Helens and can confirm
the marriage is exactly recorded as your posting.
possible baptism for Mary Brown 4-11-1783 (d/o George & Ann, Tailor)
For Henry - there are several but the most likely could be bapt. 28-11-1765 (s/o William & Elizabeth, Gardener.
Alan