Liberal Democrat Jane Dodds wins by-election
She says her constituents have 'chosen hope over fear'
Result means UK government's working majority is cut to one
The turnout in this by-election has been confirmed as 59.72%.
Dr Ed Gareth Poole from Cardiff University's Wales Governance Centre says this is the highest turnout in a parliamentary by-election since Winchester in 1997.
In the 2017 general election turnout in Brecon and Radnorshire was 74.6%.
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Des Parkinson, the Brexit Party candidate for the Brecon and Radnorshire by-election, told BBC Wales: "It looks as if we're running third at the moment.
"Coming third is what we thought would happen when we arrived here this evening.
"We've only been in existence for three and a half months," he added.
Mr Parkinson said he is sure there has been a "Boris bounce over the last week or so" to benefit the Tories.
Our reporter at the count, Teleri Glyn Jones says the turnout is 59.72%
The Official Monster Raving Loony Party leader Howling Laud Hope has arrived at the count with candidate Lady Lily The Pink.
She told the BBC last week she was standing to give people the option of saying they wanted "none of the above".
Is she destined to come sixth out of six?
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Nick Ramsay, a Conservative member of the Welsh Assembly, reckons it'll be a close run thing between his party and the Liberal Democrats.
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All eyes will be on Powys County Council chief executive Dr Caroline Turner in a few hours' time.
As the acting returning officer, she will be announcing the result.
The view from a former aide to Theresa May
Chris Wilkins, from Barry, former director of strategy for Theresa May, says: “I think at this stage of the evening it probably looks like a Liberal Democrats gain, but maybe with a smaller majority than they would have hoped.
"I think that will allow the new prime minister to say that he has managed to get the Conservative vote up and squeeze the Brexit Party vote.
"If that’s the result, there’s something in there for everyone in that outcome.”
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There are 53,393 registered voters in Brecon & Radnorshire.
Geographically it is the largest parliamentary constituency in Wales and England and it has 93 polling stations.
That means that the ballot boxes travelled an estimated 1,800 miles in total to get to the counting centre at the Royal Welsh Showground in Llanelwedd tonight.
From our reporter Teleri Glyn Jones at the Brecon & Radnorshire by-election count in Llanelwedd..
The Brecon & Radnorshire by-election was called after 10,005 people signed a petition to recall Conservative MP Chris Davies after he was convicted of making a false expenses claim.
He first won the seat in the 2015 general election and increased his majority in 2017.
Brecon & Radnorshire is represented in the Welsh Assembly by former Welsh Liberal Democrat leader Kirsty Williams. She has represented the area since the assembly was created in 1999. Since the 2016 election, Ms Williams has been the Welsh Government's education minister.
Image source, BBC/Getty/Labour/UKIPFind out more about the six contenders who have been vying for votes in Brecon & Radnorshire.
Brexit has been a big issue throughout the by-election campaign.
The constituency is within the county of Powys where 53.7% of those who voted chose Leave in the 2016 referendum.
In the most recent European Parliament elections, the Brexit Party topped the poll in Powys.
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This has been the third parliamentary by-election to be held in Brecon & Radnorshire (previously known as Brecon & Radnor) since the constituency was formed.
There was one in 1939 – eighty years to this day - after the MP was elevated to the House of Lords, and one in 1985 following the death of the Conservative MP Tom Hooson.
Welsh Affairs Editor Vaughan Roderick says this year's Brecon and Radnorshire by-election has received less media attention than the one in 1985, but it could prove to be far more important politically.
Back in 1985, the BBC devoted half of the Nine O'Clock News to discussing the result of the Brecon and Radnorshire by-election
David Deans
BBC Wales politics reporter
The Conservatives here think it will be a close-run thing tonight. "Tighter than we thought it was going to be," a source said.
The reason? Boris Johnson. They think he's taken the wind out of the Brexit Party sails, and removed the reason for Tory voters to back Nigel Farage's party.
The question is whether those voters are motivated enough to back Chris Davies, after the events of recent months - and his conviction for a false expenses claim.
The Tory source we spoke to said the only people bringing it up were Liberal Democrats. Time will tell.
David Deans
BBC Wales politics reporter
It is very, very early days - we may not get a result here for a few hours, maybe quite a few hours.
But already party activists here are considering how the day has gone.
The Welsh Liberal Democrats have thrown everything at this by-election. A Lib Dem source says they are "confident they can do this" but it is "not in the bag".
The thing to keep in mind, they said, was Chris Davies' "massive majority" in 2017, of around 8,000.
There are mixed messages from the Brexit Party. One senior figure here tonight told me they didn't think they were going to win the poll, saying second would be a good result, pipping the Tories.
But before Thursday I heard complaints from within the new party that its campaign had not been well organised and amounted to "amateur hour".
And what about Labour? The party had held the seat up to 1979. There are murmurs here tonight of the party coming fourth. Will candidate Tom Davies hold his deposit?
Prof Laura McAllister from Cardiff University's Wales Governance Centre says:
Image source, bThe first ballot boxes have arrived at the Brecon & Radnorshire by-election count in Llanelwedd. The votes will be verified before counting begins.