Try contacting the local family history society for the area concerned.. SAFHS in Scotland. Family History Federation for rest of UK. Sorry... can't do links at present.. Good Luck.
On Ancestry, for the 1911 census in the area I'm researching, one of the enumeration districts is missing. I've asked Ancestry about it, but they've basically shrugged their shoulders. How and where do I get to see the other district do you think? The County Record Office uses Ancestry