Hi, thank you both for coming back to me on this. Well the 1891 census has a Mary Lownes (should be lownds) as a widow, living with her sons, Robert (20) and Mark (7). We presumed that John had passed when Mary had Mark, however perhaps it was an affair! Appears Marks birth certificate is Mark Usber Lownds, which I am guessing is a written error. Mark married Meg in 1906.