Hi my name's Andy Ace, I came across your post while searching family history on the web. If you are looking for tie-ins I think your wife's line is directly linked to mine.
I think your mother- in law's maiden name is Eileen Ace and her younger brother is David Ace born 1938. Then I think your mother in law is my aunty as David Ace is my father. If it is true nice to meet you, if not lets see where our links meet.
As for family history, I was told once about twenty years ago by my late great aunt Myra Ace nee Schuneman that she thought the Ace name originated as Flemish ie eastern France.
Though the little research I have done points more to Norman, Norse or possibly Cornish Ancestry as it is not Welsh as most Welsh names after the English Conquest 1282-1285 have a ies or es at the end of the surname.
Good research so far by the way.
Thanks Andy Ace