The idea
Remove all compulsion to register as an elector, return to the older basis that registration is a matter of individual positive choice (provided one is eligible). Incidentally make the register of electors completely secret (except of course for public officers in the exercise of the electoral duties) so that it cannot be used for any other purpose.
Why is it important?
Basic freedom. Compulsory registration (especially on a household basis) is wrong, and the availability and use of the electoral register for unconnected purposes makes it worse.