Selina, I've been looking again at the 1788 marriage you found in Cambridge - William Hand of Ely and Mary Gotobed. The date is right, the names are right, the places are wrong. But I can't see any other marriage in Hunts or Cambs that works. I can't see a baptism of a William Hand in Ely, but there is one on 23 Mar 1764 at Wisbech, son of Edward and Mary. The timing works with a burial age of 67 in 1832, but again, the place is wrong and he didn't name a son Edward.
Does your Baptism Index show any other possibilities for his baptism c1765, or for any Hand baptisms in Cambs from 1785 onwards where the parents are William and Mary? If there are no other baptisms of children of William and Mary it makes it more likely that the Cambridge marriage is the right one.
I found yesterday in Pigots 1830 directory that William was the postmaster in Linton - I assume this was William sen rather than William his son b 1791 who I cannot trace after his baptism unless he was the witness, rather than his father, at the marriages of Mary Ann Hand in 1809 and Thomas Hand in 1816.
Many thanks
David