Hi.
Just came across your message. I am a descendant of Samuel Sissey and Elizabeth Stoote from Wisbech. This branch of the family later moved to Barking in Essex. Samuel's parents were Samuel (1735) and Sarah? I think there was also a son William. I have not investigated the other members of the Sissey Family in Wisbech but it is quite probable that they stayed in Wisbech. Hopefully this will give you some new clues.