Millions of people are voting in the European election and local council polls in England and Northern Ireland on Thursday.
It is the final big test of public opinion before 2015's general election.
All 73 UK seats in the European Parliament - the EU's only directly elected body - are up for grabs, along with 4,216 seats on local councils, nearly half of them in London.
Polling stations are open for voting between 07:00 and 22:00 BST.
In England, a third of seats are being contested on dozens of district and unitary authorities and in the 36 Metropolitan Boroughs, including Tyne and Wear, Greater Manchester, South and West Yorkshire, Merseyside and the West Midlands.
In London, every seat on all 32 London boroughs is up for election - the first time this has happened since the day of the 2010 general election.
Voters will also choose mayors in Hackney, Lewisham, Newham, Tower Hamlets and Watford.
In Northern Ireland, voters will elect 462 representatives to 11 so-called "super districts" following a reorganisation that took place in 2012, reducing the number of councils from 26 previously.
There are no local elections in either Scotland or Wales.
The weather forecast suggests that some people could have a very wet trip to the polling booths, with a Met Office weather warning covering Wales and southern England for heavy rain and possible localised flooding in areas hit by slow moving thundery downpours.
What about Scotland, Wales and Northern Ireland?
In 2009 in Scotland the SNP got 29.1% of votes, Labour 20.8%, Conservatives 16.8%, Liberal Democrats 11.5%, Greens 7.2% and UKIP 5.2%. In Wales, the stage is set for a fascinating contest. In 2009, four parties shared the spoils - with one MEP each for Labour, the Conservatives, UKIP, and Plaid Cymru. Northern Ireland is very different to the rest of the UK when it comes to the Euros. MEPs are elected using the Single Transferable Vote system - there are no party lists and you vote for a candidate by order of preference rather than a party. Ten candidates are vying for three seats.
It is the final big test of public opinion before 2015's general election.
All 73 UK seats in the European Parliament - the EU's only directly elected body - are up for grabs, along with 4,216 seats on local councils, nearly half of them in London.
Polling stations are open for voting between 07:00 and 22:00 BST.
- There are elections across the UK to the European Parliament on Thursday and elections to 161 councils in England and 11 in Northern Ireland.
- Results for the local elections will come on Friday. Results for the European elections will be announced late on Sunday. You can follow full coverage with all the latest updates at bbc.co.uk/vote2014
In England, a third of seats are being contested on dozens of district and unitary authorities and in the 36 Metropolitan Boroughs, including Tyne and Wear, Greater Manchester, South and West Yorkshire, Merseyside and the West Midlands.
In London, every seat on all 32 London boroughs is up for election - the first time this has happened since the day of the 2010 general election.
Voters will also choose mayors in Hackney, Lewisham, Newham, Tower Hamlets and Watford.
In Northern Ireland, voters will elect 462 representatives to 11 so-called "super districts" following a reorganisation that took place in 2012, reducing the number of councils from 26 previously.
There are no local elections in either Scotland or Wales.
The weather forecast suggests that some people could have a very wet trip to the polling booths, with a Met Office weather warning covering Wales and southern England for heavy rain and possible localised flooding in areas hit by slow moving thundery downpours.
What about Scotland, Wales and Northern Ireland?
In 2009 in Scotland the SNP got 29.1% of votes, Labour 20.8%, Conservatives 16.8%, Liberal Democrats 11.5%, Greens 7.2% and UKIP 5.2%. In Wales, the stage is set for a fascinating contest. In 2009, four parties shared the spoils - with one MEP each for Labour, the Conservatives, UKIP, and Plaid Cymru. Northern Ireland is very different to the rest of the UK when it comes to the Euros. MEPs are elected using the Single Transferable Vote system - there are no party lists and you vote for a candidate by order of preference rather than a party. Ten candidates are vying for three seats.
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