1851 census for Devon is easy to look up - it's on CD along with Norfolk and
Warwickshire, published by LDS.
Other counties, however, are a different matter - some are indexed in parts,
others not at all. See www.genuki.org.uk/gs/Newbie.html
information, and the Genuki pages for the relevant district to find out more
about whether or not the area in which you are interested has been indexed.
I wonder if SKS would look up the 1851 census for me to see if you
find an ELIZABETH GRATTON b abt 1836 in South Molton North Devon. I think
she may have been in South Wales possibly Merthyr Tydfil. It may solve a
mystery of why she is not on the Devon census and why she married in Merthyr
Tydfil and not her home parish.
I would be most grateful for any help .