Hi gaffy
Yes I've been trying to find census record's to see when they came to England. But couldn't see them in Burslem prior to 1901 when it was James and Bridget. Don't know if James parents stayed in Ireland or if they came to England.
It's really hard going
Regards
Wendy
Have you looked for them separately on an English census as children or young people? One of my Irish couples are missing from 1891 English census; I assume they went to Ireland to show-off their first-born baby son. They are both on 1881 census, the young man as a farm labourer in lodgings, the girl with her parents a few miles away. Btw aforesaid baby was born at home of his grandparents who by then had moved to a town about 15 miles away. This was in keeping with an Irish tradition of a woman going to her mother's house for birth of first-born.
Another Irish couple, or the woman at least, moved between North-West and North-East England and back again, children born in both regions.