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Polling station in Haringey, London
Polling stations will be open across the country from 7am to 10pm, and an exit poll at 10pm gives an indication of the result we can expect. Photograph: Alex Segre/Alamy
Polling stations will be open across the country from 7am to 10pm, and an exit poll at 10pm gives an indication of the result we can expect. Photograph: Alex Segre/Alamy

General election 2017 explained: everything you need to know

This article is more than 7 years old

When do the polls open, how can I vote and what will the UK election result mean for Brexit?

Theresa May announced a snap election in a surprise statement outside Downing Street last Tuesday, arguing that at a time of “enormous national significance” there should be unity in Westminster, but instead there was division. “The country is coming together, but Westminster is not,” the prime minister told the nation.

MPs voted overwhelmingly, by 522 votes to 13, to bring forward the election from its scheduled date of 2020. Here is everything you need to know about it.

What is a snap election?

Under the 2011 Fixed-term Parliaments Act, passed when David Cameron was prime minister, general elections in the UK are supposed to take place every five years on the first Thursday in May.

A snap election can be called for two reasons: if there is a vote of no confidence in the government or if MPs vote for an early election by a two-thirds majority.

When is polling day?

The vote will take place on 8 June. This means parliament will be dissolved on 3 May, 25 working days before the election, and what is called the “short campaign” will begin. MPs will lose their pay and privileges (though the prime minister remains in charge of the country) and candidates are subject to strict limits on campaign spending. Expect leaflets, posters, phonecalls and doorsteppers.

There is another vote on 4 May for county and unitary councillors and new “metro mayors”. These are local elections, not to be confused with the general election. It is unusual to have two big elections so close together, and it is expected that the local election result will be an indicator of what we can expect in June.

What time are polls open?

Polling stations will be open across the country from 7am to 10pm, and an exit poll at 10pm gives an indication of the result.

The counting begins after polls close and takes place through the night, with the first seat usually declared before midnight. If it is a strong victory for one party, the final result can be predictable by about 3am.

All those registered to vote will receive a poll card before the election which tells you when to vote and where your polling station is. If you forget or lose your poll card, you can still vote. At the polling station, staff will give you a ballot paper which lists the candidates you can vote for and you take this into a private booth.

How do you register to vote?

You must be registered to have a vote in the election.

You can register at gov.uk/register-to-vote, which requires you to answer 11 questions including your name, address, national insurance number and whether you want a postal vote. The deadline to register to vote is midnight on 22 May.

To qualify to register to vote you must be a British citizen, a qualifying Commonwealth citizen resident in the UK, or an EU citizen resident in the UK.

I’m a student. Where do I register to vote?

If you are a student you may be able to register to vote at both your home and term-time addresses, but remember that in a general election it is illegal to vote more than once.

How does postal voting work?

You can apply for a postal vote if you are away on the date of the election by filling out a form and sending it to your local authority. A postal vote can be sent to your home address or any other address that you provide, including overseas, but you must return your ballot paper so it arrives back by 10pm on polling day.

Alternatively, you can apply for a proxy vote, which means someone else will be allowed to cast your vote at the ballot for you. The person you appoint as your proxy must be over 18 and registered to vote.

Can we trust the polls?

Most polls wrongly predicted the outcome of the last general election in 2015. This may have been because people changed their mind at the last minute or they were what has been referred to as “shy Tories” – those who felt uncomfortable revealing to pollsters that they intended to vote for the Conservatives.

Before the 2015 election, both Mori and ICM polls came up with leads of one point for the Conservatives and one point for Labour. An Ashcroft poll on the day of the election showed a three-point lead for the Conservatives and a YouGov poll on the day suggested a dead heat. The last Populus vote gave Labour a one-point lead.

In the end, the Conservatives had a seven-point lead.

During the EU referendum campaign, polls did indicate a possible leave vote in the first weeks of June, but edged back to remain in the final days before the vote. Just two of the six polls released the day before the referendum, those carried out by TNS and Opinium, gave leave the edge.

This is why Jeremy Corbyn has insisted Labour has a chance of winning despite poor opinion poll ratings. The latest ICM poll for the Guardian gives the Tories a 21-point lead over Labour, their largest in this particular poll since 1983. But asked about the polls by a reporter on Thursday, Corbyn said of his leadership bid: “All I can say is, in 2015 almost exactly two years ago I was given 200-1 as an outside chance.”

ICM polls for the Guardian

What does the election mean for Brexit and what does Brexit mean for the election?

It is unlikely that the result of the election will affect Brexit, with both the Tories and Labour saying they will enact the EU referendum result, though if Labour wins we might be more likely to see a “soft Brexit” as opposed to a hard one.

There are a number of MPs who campaigned differently from the way their constituency voted, for example the Labour MP for Vauxhall, Kate Hoey, who backed Brexit, while only 22% of her constituents voted to leave. And while nationally Labour campaigned for remain, many traditionally Labour constituencies voted to leave the EU. How this plays out in the general election remains to be seen.

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