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General election on 8 June
Polls are now open around the country and will close at 22:00 BST.
A total of 4,851 council seats are up for grabs in 88 councils - all of those in Scotland and Wales, plus 34 in England, including 27 counties.
Six new "metro mayors" will be elected, covering areas including Greater Manchester, the West Midlands and the West of England.
It is picturesque, with stunning views of Pen y Fan and a charming rural setting, but Yscir has a unique problem.
The Powys community, near Brecon, which has about 1,000 residents, is the only ward in Wales where no-one wants to stand as a councillor.
It is set to go unrepresented on Thursday as voters across Wales go to the polls for the local elections.
Jamie McIvor
BBC Scotland
Image source, PAA system of proportional representation called the Single Transferable Vote - or STV - is used for Scottish council elections.
In each part of Scotland, there are three or four councillors - the number depends on the size of the ward and its population.
This is decided by the national Boundaries Commission and not the local authority.
Voting is straightforward - counting the votes is complex.
A voter numbers their candidates in order of preference and can vote for as many or as few as they wish - they should mark a 1 against their favourite, a 2 against their second favourite and so on.
Polling stations are set to open for elections to all 22 county and county borough councils in Wales.
A total of 1,161 seats are being fought as 92 candidates have already been returned unopposed, while one ward in Powys has attracted no candidates.
Elections are also taking place for town and community councils.
Most councils will count the votes overnight but nine areas will not start full counts until Friday.
Image source, PAA total of 4,851 council seats are up for grabs across England, Wales and Scotland.
These figures are estimates because there have been boundary changes since they were last contested.
There are also 687 independent councillors, with no party allegiances, whose seats are being contested. The rest of the total is made up of residents' association councillors and parties with a handful of representatives, including Cornish separatists Mebyon Kernow, who have four councillors.
Six areas of England will choose new kinds of mayor - metro mayors - on 4 May
As well as electing local councillors in next month's local elections, six areas of England will also be choosing so-called metro new kinds of local leadership.
On 4 May 2017 six regions of England will hold elections for newly created combined authority mayors.
These new mayors' remits will cover multiple local authorities, in mostly urban areas.
Their main responsibility will be to decide their region's economic strategy, and many will have powers covering other areas such as transport and housing. However, their exact powers will vary according to the terms of the agreements each region has made with the government.
In addition, Doncaster and North Tyneside councils are holding elections for directly-elected mayors. The mayors act as executive leaders of these local authorities.
Why are elections in the UK held on Thursdays?
Strict rules mean the BBC, like other broadcasters, isn't allowed to report details of campaigning while the polls are open.
In all national elections, the BBC is required by electoral law to adopt a code of practice, ensuring fairness between candidates.
The basic principle behind due impartiality in political coverage is set out in the agreement accompanying the BBC Charter.
This requires the BBC over time to "give due weight and prominence to all the main strands of argument and to all the main parties".
So, on polling day specifically, the BBC doesn't report on any of the election campaigns from 00:30 BST until polls close at 22:00 BST on TV, radio or bbc.co.uk.
Good morning. Voters are set to go to the polls for local and mayoral elections in England, Wales and Scotland.
A total of 4,851 council seats are up for grabs in 88 councils - all of those in Scotland and Wales, plus 34 in England, including 27 counties.
Six new "metro mayors" will be elected, covering areas including Greater Manchester, the West Midlands and the West of England.
Polling stations will open at 07:00 BST.