BBC News - Teenager arrested on suspicion of hacking
21 Jun 2011 ... Channel 4 News claimed LulzSec may have succeeded in hacking into the database of the 2011 census, which hold details of every UK citizen ...
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How can they have stolen something that hasn't been collated yet.
50 million separate forms are useless . It takes years to compile all the separate bits of information . They would need to cross reference the forms to identify an individual. Which would require hacking into every single council.