PM Cameron casts ballot as UK votes

Voters are going to the polls across the country to decide who will form the next government.

Polling stations opened at 7am and close at 10pm in the United Kingdom's 650 constituencies.

Conservatives leader David Cameron has cast his vote in Witney, Oxfordshire, accompanied by wife Samantha, while Labour leader Ed Miliband has been seen heading into a polling booth with his wife Justine at Sutton Village Hall in Doncaster North.

UKIP leader Nigel Farage has also cast his vote at Eastcliff community housing office in Ramsgate, Thanet South.

Greens leader Natalie Bennett voted at Ossulston Tenants' Hall in the London constituency of Holborn and St Pancras and SNP leader Nicola Sturgeon told her Twitter followers that she has also voted this morning at Broomhouse Community Hall in Ballieston, Glasgow.

There are 3,971 candidates vying to take up a seat in the House of Commons.

There are 533 parliamentary constituencies in England, 59 in Scotland, 40 in Wales and 18 in Northern Ireland.

The parties are therefore trying to get 326 seats to command a majority.

A total of 10,000 council seats across 290 local authorities are also up for grabs, and six mayors in England will be elected as well.