Oh poop!!!
I can't get familysearch to let me browse the records.
There's a Lettive Newman & Lionel Sillett marriage in Feb 1793 but it's in Norwich not Kelsale. Maybe the records on Pallot's show the banns that were read in Kelsale?? or maybe it's another couple? btw I'm sure I used to be able to see Pallot's on Ancestry - I can't now though
Familysearch says they were both born in 1772 (21 at marriage) which doesn't fit with Letitia dying one year later in 1794 aged 36.
Would familysearch have defaulted the age to 21 if it stated "of full age" ?