Not sure what extra info will be on the 1911 census, but each census seems to add more doesn't it?
IIRC, personal data refers to any data that can be used to identify a living person (with the living bit viewed as v important for data protection purposes). Sensitive personal data today includes DOB, religion, etc. Not sure that kind of thing would be there in 1911 though. I suppose it is feasible that somebody on that census may still be alive, so they have to keep some data back as a safeguard. Not sure there are many 90-odd year old identity thiefs though
Eyeballs - daft question, but have you tried looking at the electoral rolls for your area? Will only give you bare bones info, but it is a start.
Cannot wait