Hi Jean,
Found the marriage of John & Ann under the spellings you gave. From the Sussex Marriage Index I found the following three Marsh/Bridger marriage's. Fingers crossed one or more might give you a lead somewhere!
Jane
Lyminster, West Sussex, Date: 6 Sep 1743:
Mary MARSH
Thomas BRIDGER
Petworth, West Sussex, Date: 4 Jul 1785:
Charlotte MARSH
Richard BRIDGER, botp (B)
Funtington, West Sussex, Date: 22 Jul 1819:
John MARSH, bach
Ann BRIDGER, sp botp (B)