Hi Bob,
I may be able to add a few pieces of your tree for you.
Elizabeth Settatree was christened 17 Nov 1782 to Jacob, at Westwell. Source: Westwell Archdeacon's.
Her parents appear to have been:
SETTERTREE [sic], Jacob and BRENCHLEY, Elizabeth who married each other on 13 June 1778 at Westwell. Jacob was a bachelor, and Elizabeth a spinster & a minor (under 21 years of age), both parties of were of the parish of Westwell. Marriage was by banns. Source: Westwell Archdeacon's.
This appears to be Jacob's christening:
SETTERTREE, Jacob christened on 18 June 1758 at Westwell to parents Robert and Jane. Source: Westwell AD.
I do not seem to have the marriage of Robert and Jane.
The marriage that I have for John Ditton and Elizabeth Settertree [sic] includes a witness by the name of William Ditton.

The marriage also states that both were single at the time.
The closest matching christening I have for a John Ditton is at Great Chart to a Thomas and Mary Ditton on 16 Oct 1774. Source: Great Chart BT.
And, as luck would have it, that Thomas and Mary also have a son named William who was christened at Great Chart on 8 Oct 1786. Source: Great Chart BT.
Thomas and Mary seem to have taken part in this marriage:
DITTON, Thomas and SANDHURST, Mary married on 10 Oct 1768 by banns at Bethersden. Source: Bethersden BT.
And, once again, I seem to have run out of useful information at this point. Well, at least, I hope these events will be of interest.
Best wishes,
Susan