Its a strange one this one.
Bernard's father according to the marriage cert was a John.
There is a Bernard Mannion baptised in Sheffield with father John in 1860. Obviously doesn't have to be this particular one and it doesn't fit the death age given on the gravestone.
I found the Bernard Mannion mentioned above having done 12 years in the army, he lists his place of birth as Dewsbury.
I can't seem to find anything else that I could say for sure is this chap.
It's an interesting hunt though.