Don't know if your still researching Irish Catholics in London but........
I've lived in London,Ont. all my life, am related to Dwyers on my mother's side, O'Callaghan, Payne, Kearney, Cary, Eddington from Ireland but died in London, Daly, O'Rourke LeClaire. I lived in London West and so knew many of the families that went to St.Peter's or St.Joseph's.
Are you related to the O'Meara's that went to St.Peters?
Would love to know about your research.