Interesting to see your post. Thomas Clemmey 1778 and Jane Robinson are 4th great grandparents to me. I an descended from their son Edward Clemmey, 1810, who went to Manchester, whereas your wife is descended from Edward's brother, Thomas, 1812, who went to Newcastle. Edward was a joiner, and I think had a stay in Lancaster gaol for bankruptcy. I have not got any furthur back with confidence, though John Clemmey and Agnes Walker are possibly Thomas Clemmey's parents (1778). That makes your wife and me 4th cousins once removed.
Best wishes