Sandra
you can't 'look up' marriages from a GRO reference....only order a copy certificate. You need to know the church to look at parish registers. But all is not lost, found this record which at least give names of their fathers.
found on Familysearch
Sue
William METCALFE age 26, year of birth 1845 married Mary DOBSON age 22 year of birth 1849 in Scarborough on 3rd July 1871.
His father Thomas and her father William.