AT THE end of today, Tuesday June 7th, many of those eligible to vote in Britain’s EU referendum will lose the chance to do so. As a consequence, they will be voiceless as their compatriots go to the polls on June 23rd in a referendum with more lasting significance for their country’s future than any general election. In future years they may well regret the outcome of that vote, and its long-term effects. But having declined to take the five minutes needed to register online and thus make their voice heard, they will have no right to complain.