This is getting more curious. Neither is clearly identifiable on the census by age or location. There are a few possibilities for Hannah in Yorkshire but not in Derby and there is one possibility in York for William except Batty is spelled Battye (though location is doubtful).
The most likely for Hannah is the following though I'm not overly confident. Dwelling: Census Place: Armthorpe, York, England Source: FHL Film 1342135PRO Ref RG11Piece 4694Folio 17Page 4 Marr Age Sex Birthplace Henry CROSS M 40 M Hodsock, Nottingham, England Rel: Head Occ: Farmer 440 Acres Employ 6 Laborers Emma A. CROSS M 34 F Northampton, England Rel: Wife Mary C. CROSS 2 F Armthorpe, York, England Rel: Daur Rose TAYLOR U 24 F Retford, Nottingham, England Rel: Serv Occ: Housemaid Hannah BRADLEY U 22 F Ball Bridge Ambergate, Derby, England Rel: Serv Occ: Cook
William is much harder to isolate a possibility. The marriage certificate should give the name & occupation of the father of each of them, as well as their occupations. Let me have those and I'll try again.