Thanks for the reminder Dathai.....I know sometimes these things in geneology research are never cut and dried!
The 1901 census:
I think there may be a match between Mary Mason a servant at Marlborough Road, Glasthule, aged 18 and John Quinn aged 25 and a labourer at Sallynoggin Road, Glasthule.
The age for Mary according to her birthdate and when the census was taken would have made her 18 at the time.