Register to vote

https://www.gov.uk/register-to-vote

GOV.UK - Register to Vote

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You can register to vote at any time, whether there's an election happening or not. Once you've registered you won't need to do so again, unless you change address or change any of your other personal details. This online form on GOV.UK is the easiest way to make sure you are registered.
http://bitetheballot.co.uk/

Bite the Ballot

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Even when there isn't an election taking place, you still might want to know about politics and why you should vote? After all, there's nothing like being prepared! This website is full of useful resources that can help you answer that all-important question: “Why should I vote?”.
http://www.aboutmyvote.co.uk/

About My Vote

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About My Vote is a website run by The Electoral Commission that provides answers to all the big questions you may have about elections, voting and referendums.