Thank you for all your replies - I think all the Beauchamp Bagenals must be related, but perhaps I have been a bit assumptive that John Henry B B was born in Nova Scotia - I can only find "Canada" on censuses (except one that states America). His mother, Louisa Catherine Creighton was born in Halifax, NS, and again, I assume she married there.
I was aware of the Gazette entry, in fact, its where I found John Henry B B's father's full name.
I've tried googling, as the Bagenals are a far flung family, Ireland, Canada, Uk etc, but without precise success.
One point, John Henry had 2 elder brothers, John J Doyle Bagenal born 1856, Halifax, NS and Francis H Walsh Bagenal born 1859 same place.
any further suggestions gratefully accepted....
Best wishes
Pat