Hello Heidi,
As Chris says, I have the Sussex Marriage Index and I have looked up Jospeh Baldock. Three marriages appear:
Ticehurst, East Sussex 10 Apr 1787:
Joseph BALDOCK & Sarah BRITT, botp (B)
Extra Information: Witness wit: BRITT John; BROCKHURST James
Wadhurst, East Sussex 13 Apr 1806:
Joseph BALDOCK & Hannah CHANDLER, botp (B)
Ticehurst, East Sussex 22 Feb 1808:
Joseph BALDOCK & Vashti DOUST, botp (B)
Extra Information: Witness wit: Jn D; BALDWIN Eliz
So that's a bit of a problem. There are a number of J* Baldock marriages around that time but none with Mary as the bride.
The closest I can get are the following:
Wadhurst, East Sussex, 20 Jan 1793:
Daniel BALDOCK, wdr & Mary SMITH, botp (B)
Wadhurst, East Sussex 19 Aug 1810:
Thomas BALDOCK & Mary MOREN, botp (B)
Battle, East Sussex, 2 Jul 1800:
Benjamin BALDOCK, bach & Mary BARHAM, sp botp (B)
There may be others but I set my criteria for 1800 =/- 10 years.
But the IGI lists a Joseph Baldock m Mary Francis 11 Dec 1798 at St Nicholas Rochester, Kent. Does that help?
Nell