Kay, could your ancestor have been living in an institution of some kind such as an orphanage or workhouse? If so, then these details were not published when the 1911 census was released 'early' due to the 100 years law.

I found this out when I was also looking for someone who I know was in the Douglas Ind. Home when the census was taken. The rest of the 1911 information should be released in January 2011.