Millions of voters are casting their ballots in the UK’s first July general election since 1945.
Polling stations, set up in buildings like local schools and community halls, are open between 07:00 and 22:00 BST on Thursday.
Around 46 million voters are eligible to elect 650 members of Parliament to the House of Commons.
The results for each area, or constituency, will be declared through the night and into Friday morning.
Political parties are looking to win more than half the seats, 326, to form a majority government.
The election, called by Prime Minister Rishi Sunak in May, is taking place under new constituency boundaries following a scheduled review to take account of population changes.
The new boundaries, based on voter registration figures, have seen England receive an additional 10 MPs, taking its total seats to 543.
The number of seats in Wales has dropped by eight to 32 seats, with the total for Scotland falling from 59 to 57. Northern Ireland stays the same with 18.
Anyone aged 18 or over can vote, as long as they are registered and a British citizen or qualifying citizen of the Commonwealth or Republic of Ireland. Registration closed on 18 June.
Following a legal change in 2022, an estimated two million British citizens who have been living abroad for more than 15 years were able to register to vote
