A quick recap just before we start to hear the main events of the day - the leaders’ speeches to the CBI:

• Business is the focus of the day - with Boris Johnson, Jeremy Corbyn and Jo Swinson will all try to woothe business community with promises to do things differently if they win power
• The Tories focus on their promise to get Brexit done - the Lib Dems on their promise to stop it
• Labour is particularly talking about apprenticeships and investment around making Britain greener
• But Mr Johnson and Mr Corbyn could both face tricky questions. The former, about how exactly he plans to fulfil he promise of reaching a trade deal with the EU by the end of next year - and how he’ll keep businesses supplied with labour while also cracking down on immigration.
• For Mr Corbyn, there are questions about some of Labour’s ambitions when it comes to nationalisation of industries, like broadband.
• Elsewhere, the Lib Dems and the SNP go to the High Court to demand they be included in ITV’s election debate on Tuesday.
• And Jennifer Arcuri - the womanat the centre of a row involving Boris Johnson - angrily accuses the PM of “throwing her to the wolves”, but continues to insist the achievements she made in business were hers and hers alone.

Victoria Derbyshire

Ms Arcuri says Boris Johnson should have declared their relationship to the Greater London Authority when he was mayor of London.

When he was previously asked about the issue, the prime minister said there was "no interest to declare".

Asked whether declaring their relationship would have been "the transparent and open thing to do", Ms Arcusi replies: "Yes - if that’s what it would take to save me this humiliation.”

However, she denies receiving favourable treatment from Mr Johnson and insists her achievements in the tech sector were hers and hers alone.

Victoria Derbyshire

US businesswoman Jennifer Arcuri, who has been at the centre of a controversy about her relationship with Boris Johnson, has been speaking to the BBC's Victoria Derbyshire programme.

It is alleged that Jennifer Arcuri received favourable treatment during Mr Johnson's time as mayor of London due to their closeness - claims he denies.

She tells the programme the impact of the issue on her and her business has been "horrendous".

She criticises the prime minister for not contacting her to offer support, adding that her legacy has been "tarnished".

She accuses him of being "as shallow as a paddling pool".

Tom Symonds
Home Affairs Correspondent

The SNP's Westminster leader, Ian Blackford, has also arrived at the High Court for the legal challenge against ITV's election debate. He says he hopes "sense prevails" and the SNP will be represented.

On the way in he said: “This is really important because lots of people make their minds up on how they're going to vote in the election campaign based on these debates.

"And the first one is really critical. So many people take their opinions from that debate.

"Let's remember that we may well end up in a hung Parliament and people have the right to scrutinise the SNP, what would we do in such a scenario, and what are the policies that we're putting forward."

Asked what would happen next if the SNP didn’t get the result it wanted, he said: "We'll put our case in front of the judges and we'll see what happens but this is about fairness.

"It is about democracy. This isn't a two-party system."

Image source, Getty Images

There are 24 days until the election, but are you registered to vote? The deadline is 26 November, so the clock is ticking.

Here's our page for more details on how to do it and answers to other question you may have.

Tom Symonds
Home Affairs Correspondent

The Liberal Democrat chairman, Sal Brinton, has described a decision by ITV to deny the party’s leader Jo Swinson access to a TV debate as “weak and shameful”.

Arriving at the High Court to challenge the decision, she said: “No TV executive should have the power to decide which voices are represented to the British people, and no individual should have it dictated to them, who their vote should be between.

“Jo Swinson's Liberal Democrats are the voice of Remain. The appetite in this country to hear that argument - amassed with the existing support in the UK for remaining in the European Union - is undeniable.

“Even if you don't agree with that view, to deny it, and its representation at the debating table, is weak and shameful. We look forward to putting our case to the court today.”

She told the BBC: “This is about the breach of the Ofcom code. But it's particularly serious given this is an election about Brexit, and there is no Remain voice at the table. That's the fundamental problem.”

“Unfortunately, ITV seems to have forgotten the European results where the Liberal Democrats beat both the conservatives and Labour, not just in seats, but in votes too. And that's the problem."

Norman Smith
Assistant political editor

All three leaders are trying to pitch for the business vote at the CBI conference.

In normal times you would say this was a home match for the Tories, but less so now, very obviously because of Brexit and the deep disquiet among the business community about what that will mean in terms of future trading relationships with the EU.

There’s also disquiet about Boris Johnson himself. He has been rude about business in the past and there’s a lot of unhappiness about his immigration policy.

It will be interesting to see what reception Jeremy Corbyn gets too. Normally the questions from business leaders tend to be perfectly courteous, not too probing.

I wonder if we might see a different tone today - in part because of John McDonnell’s bombshell announcement that a Labour government would nationalise parts of BT.

That took the business community completely by surprise.

Labour Party members passed a motion at conference in September to significantly speed up efforts to reach net zero carbon emissions in the UK. The current target is 2050, but they voted to make it 2030 instead, and have been pushing for that commitment to be included in the general election manifesto.

The BBC's political correspondent Iain Watson said the GMB unon and others objected to 2030 as a deadline, though, arguing it could hit workers in traditional "dirtier" industries hard.

So the date will be in the manifesto but as a target to work towards rather than a firm deadline.

This morning was the first time a senior figure has been asked about the issue since a crucial meeting over the weekend.

Reaching net zero carbon emissions is a huge task and will require major changes to energy generation, transport and other sectors.

Professor Sir John Curtice
Polling expert

We haven’t had very much in the way of separate polling for Scotland - what we have now dates from mid-October when the Conservatives were in a weaker position than they appear to be in the UK-wide polls now.

If we take that into account and we look at some of the Britain-wide polls, it’s still perfectly clear that the SNP should, at least, hold the share of the vote that they had last time.

But the Conservatives have, perhaps, now recovered some ground north of the border, such that they might have a reasonable chance of hanging on to a fair number of the 13 seats they are trying to defend.

For the Labour Party, north of the border it doesn’t matter what polling you look at - it’s relentlessly pessimistic and the SNP will certainly be hoping to pick up many if not all of the seats they lost to Labour back in 2017.

Image source, PA Media

Labour leader Jeremy Corbyn will be talking later about the party’s plans for apprenticeships, including something known as the apprenticeship levy - but what exactly is it?

The government radically changed the apprenticeship system in 2017, introducing a levy or tax on large employers which they can then claim back to fund training.

But rather than boosting the number of apprenticeships, according to figures in March, they have fallen by a more than a quarter with many small firms giving up on schemes and larger ones failing to even claim back the money they paid in, leaving £2bn unspent.

Many larger firms regard the apprenticeship levy as little more than an extra tax on their wage bill, while many smaller companies are reluctant to have their apprentices go to college one day a week.

Just before the new scheme was introduced there were 509,400 starts a year; last year there were just 375,800, a fall of 26%.

Read more about how apprenticeships work here.

What would you like to ask the Labour Party? We'll be putting your election questions to them today on the BBC News Channel at 11:30 GMT.

You can get in touch via email at yourquestions@bbc.co.uk, via WhatsApp on +44 7756 165803 - or you can submit your questions here. Follow that link to also see some of the questions our team has already answered.

We should start to get some manifestos this week - detailed documents setting out the parties' policy plans - including that of the Green Party.

The Green Party of England and Wales primarily exists to champion environmental causes but is keen not to be seen as a single-issue campaign party and has policies in all areas. So what else do they stand for?

You can read our simple guides to the Greens and other parties here.

Today Programme
BBC Radio 4

Polling expert Sir John Curtice says Labour has made "a bit of ground at the expense of the Liberal Democrats" among Remain voters so far during the campaign.

But he adds that trying to persuade voters on the Leave side of the argument to support Labour on the basis of its domestic agenda is "not having any cut-through at all".

"Labour's share of the vote amongst Leave voters - a grand total of 14% - is exactly the same now as it was a week ago.

"Equally for the Liberal Democrats, another absolutely clear message, that a lot of them think they can forge ahead by taking away Remain voters from the Conservatives - well, I have to say the polls suggest that so far again their strategy is not doing much good."

Sir John said there was a "binary choice" when it comes to Brexit at the election - and at the moment the polls were "quite firmly pointing" towards a Conservative majority.

Chris Morris
BBC Reality Check

It's no surprise that the lines we have been given ahead of Boris Johnson’s speech later focus on his promise to get Brexit done and leave with a new deal that ends the current uncertainty.

It’s worth emphasising again, though, that leaving the EU in January - if that happens - won’t end the uncertainty as the UK still has to negotiate its future relationship with the EU.

On Mr Johnson’s timetable, it has to do that in record time by the end of next year.

What most CBI members want to know is what the terms of trade will be with our nearest neighbours in a year’s time. Secondly, they asking what will be in place in terms of immigration policy to allow them to recruit from abroad - especially low-skilled labour.

So there will be scepticism in the room for Mr Johnson, but a lot will be reserved for Jeremy Corbyn too.

The CBI said yesterday that Labour might be asking the right questions about inequality but its policies threaten to "crack the foundations of our economy".

As part of our election coverage, BBC technology correspondent Rory Cellan-Jones and economics editor Faisal Islam are monitoring political adverts on social media.

They're asking people who see adverts on their Facebook feed to send in a screenshot, along with the "why am I seeing this ad?" information that goes with it.

Here's one intriguing example they've been sent:

It's all about business today - well, so far at least - as party leaders prepare to address the CBI conference. Here are the main lines:

• The head of the CBI - Dame Carolyn Fairbairn - says businesses need to know how "the uncertainty over Brexit is going to be ended"
• Conservative Andrea Leadsom says she accepts that uncertainty is "devastating" for businesses, which why it's so important - as the party slogan goes - to "get Brexit done". She also promises "a fundamental review" of business rates, but doesn't say where the money to replace them would come from if the decision is made to cut them.

• Sam Gyimah says the Lib Dems are "the party of Remain", and the certainty they are offering comes in the form of promising to cancel Brexit altogether if they win power.
• Meanwhile, Barry Gardiner outlines Labour’s plans for 320,000 more apprenticeships, many in low carbon industries, but backs away from a 2030 target for zero carbon emissions set at the party's conference.
• Boris Johnson will be the first leader to address the CBI conference. He will be followed by Jeremy Corbyn and lastly Jo Swinson.
• Away from the CBI, the Lib Dems and SNP will be in court, having both filed separate legal challenges over their exclusion from ITV's general election debate on Tuesday

Chris Mason
Political Correspondent

My hunch is that the TV election debates will be significant, but maybe less so than in previous years. When there was a real novelty factor to them, like in 2010, they ended up shaping the whole campaign - we spent days building up to them and days talking about them afterwards. In some people's eyes they sucked the life out of it. I'm not sure it'll be quite like that this time.

There are certainly a lot of debates though, and they're contentious. The Lib Dems and the SNP both argue they could hold the balance of power in the UK after 12 December so shouldn't be excluded from any of them.

Image source, ITV Wales

The TV electioneering has already begun in Wales, where five leading politicians vied for votes in the first debate on Sunday night.

Labour's Nick Thomas-Symonds, Liberal Democrat Jane Dodds, Liz Saville Roberts from Plaid Cymru, Conservative David TC Davies and the Brexit Party's Nathan Gill rowed over poverty and the impact of Universal Credit.

Today Programme
BBC Radio 4

On any given morning, the political parties pick their spokesperson who then does the rounds on various media outlets. As it's Andrea Leadsom for the Conservatives, here's some more from her.

On Brexit, the business secretary agrees that uncertainty is “absolutely devastating for business”, but the economy is doing well “despite that uncertainty”.

Her comments come a week after official figures showed that Britain's economy had grown at the slowest annual rate in almost a decade.

Ms Leadsom says there are lots of small businesses who are “desperate for the certainty that leaving the EU will provide”.

She says the Tories are planning “a fundamental review” of business rates, as they want to look at the entire system "to make sure it’s fit for purpose”.

Business rates are the one tax that business organisations tell us isn’t working for them, she says, so the Tories are "determined to reform it".

Asked about where the money comes from to cut business rates, she says: "You're assuming that money comes from somewhere."

She adds: "There are very practical possibilities - we have everything set out in our manifesto."