Thanks for your reply regarding Henry Mather and Elizabeth Frodsham - that's helpful information. I shall do some more research on Joseph Frodsham and try to determine who his wife was and who his parents were etc.
I have a Mather line in my family tree also, starting with Margaret (Ann?) Mather 1847-1907 who married a Moses Trantum - she was my 3rd great grandmother on my mother's side. Margaret Mather's father was Thomas Mather 1825-1896 who married Ann Parr. Thomas' father was Henry Mather 1803-1839 who married Elizabeth Frodsham. I seem to have hit a brick wall at Henry and Elizabeth as I can't find their Rainford wedding record of 1825 to determine their parents' names etc.