Ok...so got copy marriage certificate between James William Tulloch and Eliza Jane Butler (Burns). She named her father as being James Butler (deceased - he was, dying in 1901), a glass maker. One of the witnesses was a Peter Butler, her half brother.
James Butler was her stepfather, her mother married him in 1884.
So, I'm guessing she was born as 'Burns' but has assumed her stepfather's surname, but used her original surname when registering her children's births!
So confusing!!
Sue