Following on from what you have said I have had a close look at Eliza. I have found an Eliza Ann Greenfield, Caistor that covers Waltham I checked this time. Sep Qtr 1857 again born before marriage In the same Qtr there was an Eliza Fletcher born in Caistor.
Everything surrounding Martha is a mystery or appears to be.
My Grandfather was John William Fletcher he was the only one left on the farm 1901 Census. Martha listed as Head and Employer. John W as a Worker. It seems Martha passed away in 1904 and John W married in 1905. That's what I meant about the generations repeating themselves. 1911 Census has John W working on a farm in Scartho. So what happened to the farm?
The next mystery is that my father George W, His brother Robert A, and sister Nellie M. Have never spoke of there being any Uncles or Aunts from their fathers side of the family but spoke of uncles on mothers side. They are all passed on now so I can't go and ask them.
I am hoping to find some answers when I visit the UK later this year.
Any further comments on this will be most welcome
Robert G Fletcher