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Aside: UK is in the process of updating how The Electoral Roll is managed from the policy perspective, with an Act of Parliament mandating that new process be in place by 2014 that ensure the electoral roll record is maintained by each individual voter, rather than by head of household as happens at present. The Act of Parliament does not/ will not mandate any specific technological route for the new mechanism, technical choices will be made on merit, with each deployer able to make their own decisions.
One individual-centric variant of a new process could work as follows: