So the marriage is on family search:
Name: Samuel Woodhead
Spouse's Name: Alice Shaw
Event Date: 1821
Event Place: Saddleworth, York, England
Indexing Project (Batch) Number: M13533-9
The 1851 census form has obviously been damaged, and FMP have transcribed Alice incorrectly. This is the Ancestry one:
http://interactive.ancestry.co.uk/88...l=ReturnRecord