I don't know if this will be of any interest, but I have a marriage certificate dated  April 17 1853, of a James Shaughnessy  marrying Mary White, in Salford, Lancs. One of the names of the 2 witnesses of their marriage  looks to me to be James W. McGoveren.  James Shaughnessy was born in Ireland but no county was listed. he emigrated to England with his father, mother, and brother. between 1833 and 1843.  Perhaps try the census for Salford 1851?