Millions of people are heading to the polls today to decide if Britain remains part of the European Union, or will leave it forever.
If you are eligible to vote, you should have been sent a polling card in the post. If you aren't sure, read on to find out more.
Am I registered to vote?
To find out if you’re registered to vote in the EU referendum, contact your local electoral registration office. To do this, click the 'find now' button on the About My Vote website.
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You will then see a phone number and email for your local office.
Tim Ireland/AP
Who can register to vote?
You can register to vote if you are:
16 or over in England and Wales (but you cannot actually vote until you are 18); or 14 or over in Scotland (but you cannot vote in local elections and elections to the Scottish Parliament until you are 16, or elections to the UK and European Parliaments until you are 18).
A UK, Republic of Ireland or qualifying Commonwealth citizen - meaning have leave to enter or remain in the UK, or do not require such leave.
A citizen of a European Union country living in the UK.
A citizen of the Channel Islands, the Isle of Man or a British Overseas Territory living in the UK.
What's the deadline to register to vote?
The deadline to register for the EU referendum has already passed, but you can still register for future votes at any time of the year here. It takes just five minutes.
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Where is my polling card for the referendum?
If you think you have registered but haven’t received a card, check with your local authority which you can find here.
Where do I go to vote in the referendum?
By now, you should have received your polling card in the post. It will tell you where your polling station is.
When are polling stations open?
Between 7am and 10pm on Thursday.
Andrew Yates / Reuters
A man walks into a polling station to vote in the EU referendum, in Etherow country park in Stockport, Britain June 23, 2016. REUTERS/Andrew Yates
Dylan Martinez / Reuters
A policeman stands outside a polling station in Biggin Hill, Britain June 23, 2016. REUTERS/Dylan Martinez
Neil Hall / Reuters
A man wearing a European themed cycling jersey arrives to vote at a polling station for the Referendum on the European Union in north London, Britain, June 23, 2016. REUTERS/Neil Hall
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Stefan Wermuth / Reuters
Britain's Prime Minister David Cameron and his wife Samantha leave after voting in the EU referendum, at a polling station in central London, Britain June 23, 2016. REUTERS/Stefan Wermuth
Neil Hall / Reuters
A woman photographs her daughter after she voted at a polling station for the Referendum on the European Union in north London, Britain, June 23, 2016. REUTERS/Neil Hall
Stefan Wermuth / Reuters
Britain's Prime Minister David Cameron and his wife Samantha leave after voting in the EU referendum, at a polling station in central London, Britain June 23, 2016. REUTERS/Stefan Wermuth
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Andrew Yates / Reuters
People arrive to vote at a polling station for the Referendum on the European Union in Heald Green, Stockport, Britain, June 23, 2016. REUTERS/Andrew Yates
Neil Hall / Reuters
Electoral workers carry signs as they prepare a polling station for the Referendum on the European Union in north London, Britain, June 23, 2016. REUTERS/Neil Hall TPX IMAGES OF THE DAY
Neil Hall / Reuters
A polling station is prepared for the Referendum on the European Union in north London, Britain, June 23, 2016. REUTERS/Neil Hall
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Stefan Wermuth / Reuters
A man carries an umbrella as he leaves a polling station for the Referendum on the European Union in north London, Britain, June 23, 2016. REUTERS/Stefan Wermuth
Toby Melville / Reuters
Women walk past a pub being used as a polling station for the Referendum on the European Union in west London, Britain, June 23, 2016. REUTERS/Toby Melville
Andrew Yates / Reuters
A man puts up a sign at a polling station for the Referendum on the European Union in Heald Green, Stockport, Britain, June 23, 2016. REUTERS/Andrew Yates
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Matt Cardy via Getty Images
LONDON, UNITED KINGDOM - JUNE 23: Labour Party leader Jeremy Corbyn walks with Labour Party activists as he leaves his home to cast his vote at a polling station at Pakeman Primary School in Islington on June 23, 2016 in London, England. The United Kingdom has gone to the polls to decide whether or not the country wishes to remain within the European Union. After a hard fought campaign from both REMAIN and LEAVE the vote is too close to call. A result on the referendum is expected on Friday morning. (Photo by Matt Cardy/Getty Images)
Matt Cardy via Getty Images
LONDON, UNITED KINGDOM - JUNE 23: Labour Party leader Jeremy Corbyn stops for a photograph with members of the public as he leaves his home to cast his vote at a polling station at Pakeman Primary School in Islington on June 23, 2016 in London, England. The United Kingdom has gone to the polls to decide whether or not the country wishes to remain within the European Union. After a hard fought campaign from both REMAIN and LEAVE the vote is too close to call. A result on the referendum is expected on Friday morning. (Photo by Matt Cardy/Getty Images)
Matt Cardy via Getty Images
LONDON, UNITED KINGDOM - JUNE 23: Labour Party leader Jeremy Corbyn walks with Labour Party activists as he leaves his home to cast his vote at a polling station at Pakeman Primary School in Islington on June 23, 2016 in London, England. The United Kingdom has gone to the polls to decide whether or not the country wishes to remain within the European Union. After a hard fought campaign from both REMAIN and LEAVE the vote is too close to call. A result on the referendum is expected on Friday morning. (Photo by Matt Cardy/Getty Images)
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Matt Cardy via Getty Images
LONDON, UNITED KINGDOM - JUNE 23: Labour Party leader Jeremy Corbyn walks with Labour Party activists as he leaves his home to cast his vote at a polling station at Pakeman Primary School in Islington on June 23, 2016 in London, England. The United Kingdom has gone to the polls to decide whether or not the country wishes to remain within the European Union. After a hard fought campaign from both REMAIN and LEAVE the vote is too close to call. A result on the referendum is expected on Friday morning. (Photo by Matt Cardy/Getty Images)
Matt Cardy via Getty Images
LONDON, UNITED KINGDOM - JUNE 23: Labour Party leader Jeremy Corbyn leaves his home to cast his vote at a polling station at Pakeman Primary School in Islington on June 23, 2016 in London, England. The United Kingdom has gone to the polls to decide whether or not the country wishes to remain within the European Union. After a hard fought campaign from both REMAIN and LEAVE the vote is too close to call. A result on the referendum is expected on Friday morning. (Photo by Matt Cardy/Getty Images)
Matt Cardy via Getty Images
LONDON, UNITED KINGDOM - JUNE 23: Labour Party leader Jeremy Corbyn leaves his home to cast his vote at a polling station at Pakeman Primary School in Islington on June 23, 2016 in London, England. The United Kingdom has gone to the polls to decide whether or not the country wishes to remain within the European Union. After a hard fought campaign from both REMAIN and LEAVE the vote is too close to call. A result on the referendum is expected on Friday morning. (Photo by Matt Cardy/Getty Images)
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LONDON, UNITED KINGDOM - JUNE 23: A man holding an umbrella passes by a polling station sign during the British EU Referendum in London, United Kingdom on June 23, 2016. Voting has begun in the United Kingdoms historic referendum on its membership of the European Union. Polling stations will remain open for 15 hours until 10 p.m. local time. (Photo by Ray Tang/Anadolu Agency/Getty Images)
Matt Cardy via Getty Images
LONDON, UNITED KINGDOM - JUNE 23: Labour Party leader Jeremy Corbyn casts his vote at a polling station at Pakeman Primary School in Islington on June 23, 2016 in London, England. The United Kingdom is going to the polls to decide whether or not the country wishes to remain within the European Union. After a hard fought campaign from both REMAIN and LEAVE the vote is too close to call. A result on the referendum is expected on Friday morning. (Photo by Matt Cardy/Getty Images)
ADRIAN DENNIS via Getty Images
A sign for a polling station is attached to a fence in Little Milton on June 23, 2016.Millions of Britons began voting today in a bitterly-fought, knife-edge referendum that could tear up the island nation's EU membership and spark the greatest emergency of the bloc's 60-year history. / AFP / ADRIAN DENNIS (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
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Rebecca Naden / Reuters
A Polling Station sign for the Referendum on the European Union is erected in the village of St Florence, Near Tenby, Pembrokeshire in Wales, June 23, 2016. REUTERS/Rebecca Naden
GLYN KIRK via Getty Images
Signs are put up outside the polling station at West Blatchington Windmill near Brighton, in southern England on June 23, 2016, as Britain holds a referendum on wether to stay or leave the European Union (EU).Millions of Britons began voting Thursday in a bitterly-fought, knife-edge referendum that could tear up the island nation's EU membership and spark the greatest emergency of the bloc's 60-year history. / AFP / GLYN KIRK (Photo credit should read GLYN KIRK/AFP/Getty Images)
Andrew Matthews/PA Wire
A general view of a polling station at the White Horse Inn in Priors Dean, Hampshire, also known as the 'Pub with no name' , as voters head to the polls across the UK in a historic referendum on whether the UK should remain a member of the European Union or leave.
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GLYN KIRK via Getty Images
Presiding officer Ahmed Z Jamee prepares to open the polling station at West Blatchington Windmill near Brighton, in southern England on June 23, 2016, as Britain holds a referendum on wether to stay or leave the European Union (EU).Millions of Britons began voting Thursday in a bitterly-fought, knife-edge referendum that could tear up the island nation's EU membership and spark the greatest emergency of the bloc's 60-year history. / AFP / GLYN KIRK (Photo credit should read GLYN KIRK/AFP/Getty Images)
ADRIAN DENNIS via Getty Images
TOPSHOT - A presiding officer (L) and poll clerk (C) drink a cup of tea while waiting for early morning voters at a polling station set up in a launderette in Headington outside Oxford on June 23, 2016.Millions of Britons began voting today in a bitterly-fought, knife-edge referendum that could tear up the island nation's EU membership and spark the greatest emergency of the bloc's 60-year history. / AFP / ADRIAN DENNIS (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
Ian Forsyth via Getty Images
SALTBURN-BY-THE-SEA, UNITED KINGDOM - JUNE 23: A dog is tied to railings outside a polling station waiting for its owner to cast their vote on the EU Referendum on June 23, 2016 in Saltburn-by-the-Sea, United Kingdom. The United Kingdom has gone to the polls to decide whether or not the country wishes to remain within the European Union. After a hard fought campaign from both REMAIN and LEAVE the vote is too close to call. A result on the referendum is expected on Friday morning. (Photo by Ian Forsyth/Getty Images)
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Andrew Matthews/PA Wire
Officials wait for voters inside a polling station being used in the EU referendum in a guest house annex in Dogmersfield, Hampshire.
Ian Forsyth via Getty Images
SALTBURN-BY-THE-SEA, UNITED KINGDOM - JUNE 23: A dog is tied to railings outside a polling station waiting for its owner to cast their vote on the EU Referendum on June 23, 2016 in Saltburn-by-the-Sea, United Kingdom. The United Kingdom has gone to the polls to decide whether or not the country wishes to remain within the European Union. After a hard fought campaign from both REMAIN and LEAVE the vote is too close to call. A result on the referendum is expected on Friday morning. (Photo by Ian Forsyth/Getty Images)
Nick Ansell/PA Wire
Voters arrive the polling station set up at the Little Braxted Bakery in Little Braxted, Essex as voters are set to go to the polls to decide whether the UK should remain in the European Union.
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