Peter Bradley

Hi, I feel like I may be looking for a needle in a haystack here. I'm looking for any links to my ggg grandfather, Peter Bradley, born in Newry about 1821. On his marriage banns it states his occupation as a shoemaker and his father was Martin Bradley a Labourer. Petermarried in Manchester in 1846, therefore had obviously left Newry by then. Any leads on this would be greatly appreciated.