There is a tree on Ancestry, which states the marriage was in Swindon, Wiltshire. However, this is incorrect and should read Swindon, in Gloucestershire. I was born in Swindon, Wiltshire. There is also Swindon, Staffordshire.
Ancestry: copy of marriage

Marriage at Swindon, Gloucestershire

15 October 1783

James BRAY
Mary SAUNDERS (both of this Parish)

by banns

by William CHESTER

both sign with an X

Witnesses: Elizi X FOWLER (signed with an X)
Thomas CHERRINGTON