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The information flow presently covers both the offline and online world, although part of the logic in exploring this issue is that governments (e.g. UK) would be keen to move as much/ all of this process online if that were to possible without loss if of security/ identity assurance.
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2) The council sells an electronic copy of the roll to anyone who wants to buy it, and makes it available for use in local and national elections by political parties and those managing elections.
Aside: UK is in the process of updating how The Electoral Roll is managed, 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 variant of a new process could work as follows: