Voting is under way in a historic referendum on whether the UK should remain a member of the European Union or leave.
A record 46,499,537 people are entitled to take part, according to provisional figures from the Electoral Commission.
Polling stations opened at 07:00 BST and will close at 22:00 BST.
It is only the third nationwide referendum in UK history and comes after a four-month battle for votes between the Leave and Remain campaigns.
The referendum ballot paper asks the following question: “Should the United Kingdom remain a member of the European Union or leave the European Union?”
Whichever side gets more than half of all votes cast is considered to have won.