More than 44 million people are registered to vote. Elections are also under way for 164 English councils.

Former UKIP leader Nigel Farage has said he is "lucky to be alive" after he was in a light aircraft crash.

Voting in the general election will take place in 649 constituencies, with nearly 4,150 candidates standing for election across the country.

David Cameron was the first of the main UK party leaders to cast their vote. The Tory leader went to a community hall in the Witney constituency, Oxfordshire, shortly after 1030 BST, accompanied by his wife, Samantha.


Labour leader Gordon Brown went to vote shortly after 1100 BST at a community centre close to his home in North Queensferry, Fife. His wife, Sarah, was with him.

Nick Clegg, leader of the Liberal Democrats, arrived at a polling station in Sheffield Hallam at 1120 BST. His wife, Miriam, is unable to vote in the general election because she is a Spanish citizen.

Ieuan Wyn Jones of Plaid Cymru voted in the constituency of Ynys Mon in north Wales at lunchtime. The leader of the Scottish National Party, Alex Salmond, had already cast his vote by post.

Polling in one constituency - Thirsk and Malton - has been delayed until 27 May because of the death of one of the candidates during the campaign.

The vast majority of constituencies will conduct their counts overnight, with about 20 not due to begin the process until after 0900 GMT on Friday.

Plane crash

Among the council elections taking place, voters will choose representatives in 32 London boroughs, 36 metropolitan authorities and 20 unitary authorities.

In these elections, a total of 15,785 candidates are contesting 4,222 seats.

Voting will also take place to choose mayors in Hackney, Newham, Lewisham and Watford.

Mr Farage, a UK Independence Party Euro-MP, said he was "lucky to be alive", after being involved in a light plane crash near Brackley, Northamptonshire.
Crashed plane
Mr Farage was a passenger in the light aircraft when it crashed

He is standing in the general election in Buckingham. He suffered non-life-threatening injuries when the aircraft came down just after 0800 BST.

He was initially taken to hospital in Banbury, Oxfordshire, before being moved to the John Radcliffe Hospital in Oxford. The pilot is currently being treated at University Hospital in Coventry.

Mr Farage's agent, Chris Adams, told the BBC he had to be moved for more checks.

"I believe it's just precautionary, obviously, for chest pains and we've just got to do all the tests... and the required X-rays, and hopefully he'll be on the mend. The pilot, unfortunately, is in a more severe condition," he said.

A spokeswoman for the John Radcliffe Hospital said Mr Farage would be kept in overnight and "will be with us for a few days".

The crash is being investigated by the Air Accidents Investigation Branch and Northamptonshire Police. The aircraft was towing a banner when it crashed shortly after take-off.

UKIP spokesman Duncan Barkes said the plane "juddered a little bit" and "seemed to lose control ever so slightly".

Speaking from the scene of the crash, Detective Chief Inspector Martin Kinchin said: "Looking at the wreckage behind me, I think you can make your own judgement as to how lucky they were."

Pictures from the airfield showed the Polish-built light aircraft was left lying upside down, with its cockpit badly damaged.