Put a cross only in one box or your ballot could be counted as spoiled.
When will the result be announced?
The estimated time for the national declaration is around breakfast time on Friday 24 June, although there is considerable uncertainty about when this will be given that it is dependent on all 382 local totals being declared.
Click here for a list of estimated declaration times.
Things You Can't Do In A Polling Booth
Take A Selfie(01 of12)
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There are complex laws in place surrounding the secrecy of the ballot and so photography in polling stations is strongly discouraged.
The Electoral Commission says: “Due to the potential breach of the law, intentionally or not, we strongly advise against any form of photography taken inside a polling station."
Anyone breaching this could face a £5,000 fine or even six months in prison.
Selfies outside are fine though. (credit:PA Wire/PA Images)
Be Accompanied By Your Horse(02 of12)
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You are technically allowed to take pets to the polling station as long as they aren't disruptive to the vote.
Unfortunately, given their size, horses would probably be classed as disruptive. And messy. (credit:John Giles/PA Archive)
Take A Friend With You(03 of12)
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You can go to the polling station with friends or family if you want to go together. But you can't take them into the booth with you. (credit:Niall Carson/PA Wire)
Be A Disruptive Drunk(04 of12)
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There are no rules stopping people under the influence of alcohol or drugs from voting, and you won't be breathalysed.
But if you are disruptive you may not be allowed to vote. (credit:PeopleImages.com via Getty Images)
Discuss Who You're Voting For(05 of12)
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Once you're inside the polling booth, keep schtum. If you're suspected of trying to influence other voters you could be in big trouble.
You should also avoid talking about who you are going to vote for while inside the station. (credit:Hans Neleman via Getty Images)
Live Stream Your Vote(06 of12)
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Same as the selfie rule. Put the phones away people. (credit:patrisyu via Getty Images)
Pull An All-Nighter(07 of12)
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Once it hits 10pm, the polling station will close.
Unless there have been problems because of big queues late into the evening, you will not be able to vote after that time.
You snooze, you lose (your ability to vote). (credit:Elise Amendola/AP)
Write A Political Essay(08 of12)
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Well technically you can. But it won't be counted (it probably won't even get read) and you're hogging the polling booth. (credit:Dave Kendall/PA Archive)
Heckle Other Voters(09 of12)
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Don't be that guy. You could end up in big trouble and it's disruptive to the vote. (credit:Jupiterimages via Getty Images)
Get Frisky(10 of12)
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We shouldn't have to say this but there are likely some people out there who find our electoral system wants to make them get first past the post, so to speak.
As detailed above, you're not allowed to bring a (ahem) friend into the booth with you. So behave! (credit:Andy Sotiriou via Getty Images)
Wear Political Clothing Or Rosettes(11 of12)
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These might be classed as intimidating. Also only candidates and their polling agents are allowed to wear rosettes. (credit:Daniel Leal-Olivas/PA Wire)
Sign Your Ballot Paper(12 of12)
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Well, you can but it will count as spoiling your ballot. You're not a celebrity, no one needs an autograph. (credit:itaesem via Getty Images)