Heywood, Its OK I'll check. I need to do so anyway cos I think it shows Mary as Mary S in the 1891,. There appears to have been one or two extras who have been born and lost between cencuses along the way. I am looking at the 1901 at the moment.
The Liverpool Projects site is a good one!
Thanks ever so for your help. I am relatively new to this sort of history, I am normally involved with medieval stuff, a different ballgame entirely. P