This is also the first general election at which voters in England, Wales and Scotland will have to show photo ID to vote in person.
There are 22 acceptable forms of ID, external, including passports, driving licences, older or Disabled Person’s bus passes, and Oyster 60+ cards.
There are nine valid forms of ID, external to vote in Northern Ireland, where voters have had to show photo ID since 2003.
Alternatively, those registered to vote without the correct ID were able to apply for a free document called a voter authority certificate.
Voters in England, Scotland and Wales whose ID is lost or stolen after the deadline can apply for an emergency proxy vote, up until 17:00 on polling day, to allow another registered voter to cast a vote on their behalf.
Many people will have already voted for their favoured candidate in their constituency by voting by post.
Those who applied for a postal vote but have yet to return it can hand it into their local polling station by the close of polls at 22.00 BST.
Alternatively, they may also be able to hand it in to their local council office during office hours.
