As we've just mentioned her it seems a good moment to plug our in-depth profile of Nicola Sturgeon, SNP leader, put together by BBC Scotland correspondent James Cook.

We've been profiling all the main party leaders during this campaign, so here are the others:

• Boris Johnson's battles
• Can Jo Swinson transform the Lib Dems' prospects?
• Will Jeremy Corbyn's long march lead to power?
• Nigel Farage: The story of 'Mr Brexit'

As we've said politicians are dashing here, there and everywhere this morning, making the most of the final day of campaigning.

A bit earlier, SNP leader Nicola Sturgeon joined her party's candidate for Edinburgh South, Catriona MacDonald, on the campaign trail this morning, visiting a greengrocer and a florist.

Asked what the last message she wants voters to hear from the SNP, she says: “A Tory victory can be stopped. In Scotland that means voting SNP.

“The SNP is the main challenger to the Tories and voting for other parties risks helping the Tories.”

She says people should vote for the SNP if they don’t want to have further cuts to public services or “be dragged out of Europe against our will”.

"This election isn't going to decide whether Scotland is independent or not but it does send the clearest possible message that Scotland wants its future to be determined by all of us who live here and not by Boris Johnson and the Conservatives."

She adds that “it’s a really important choice to be made” if people don’t want to wake up on Friday morning to “a five-year Boris Johnson government”.

Read the BBC's guide to the SNP's key manifesto promises here.

We've been profiling the main party leaders in depth during this campaign.

In this piece, BBC political correspondent Jonathan Blake has an in-depth look at Jo Swinson and whether she can transform the Lib Dems' fortunes.

Here are the other profiles to peruse too:

• Boris Johnson's battles
• Can Nicola Sturgeon deliver Scottish independence?
• Will Jeremy Corbyn's long march lead to power?
• Nigel Farage: The story of 'Mr Brexit'

Earlier, we mentioned the suggestion from the Atlantic's Tom McTague that nerves appeared to be frayed on all sides.

This, from the executive editor of the Conservative Home website, lists just some of things that might be on the minds of those campaigning...

Rory Cellan-Jones
Technology correspondent

Image source, GE

In early November, we asked you to send us targeted election ads you had seen on social media. We've had a tremendous response, with more than 1,800 messages so far.

Looking through them, a number of questions arise. How are these ads targeted, do they work, and are new laws needed to control them?

Read more from Rory here.

• Watch the election night special programme with Huw Edwards from 21:55 GMT on Thursday on BBC One, the BBC News Channel and iPlayer
• As polls close at 22:00, the BBC will publish an exit poll across all its platforms, including @bbcbreaking , externaland @bbcpolitics, external
• The BBC News website and app will bring you live coverage and the latest analysis throughout the night
• We will feature results for every constituency as they come in with a postcode search, map and scoreboards
• Follow @bbcelection , externalfor every constituency result
• From 21:45 GMT, Jim Naughtie and Emma Barnett will host live election night coverage on BBC Radio 4, with BBC Radio 5 live joining for a simulcast from midnight

Politicians have been busy on the morning programmes, in a final push to get their party's messages across:

• Michael Gove faced questions about the prime minister's response to a photo of a sick boy who was forced to sleep on a hospital floor as well as the London Bridge terror attack. Mr Gove defended Mr Johnson insisting he had shown empathy and it was right to have a broader public debate about automatic early release of prisoners. More broadly, he had one key message - you guessed it - vote Conservative to "get Brexit done"
• Labour's John McDonnell was also challenged over Jeremy Corbyn's leadership credentials, amid suggestions that he is unpopular on the doorstep. Mr McDonnell insisted Mr Corbyn was trusted by voters. He also attacked the leak of a secret recording of shadow health secretary Jonathan Ashworth criticising the Labour leader as "gutter politics". He insists Labour is offering real change - not more austerity under the Tories
• Out on the road, the prime minister began the day doing a milk round in west Yorkshire, where he told reporters the election "could not be tighter". You can see the latest opinion poll trends with the BBC's poll tracker.
• Mr Corbyn's first stop of the day was in Glasgow, where he argued Labour's campaign had been "positive" while his opponents had been "negative".
• With trust a big theme of this campaign, Plaid Cymru leader Adam Price is using its final day to publish a draft law which would make lying by politicians a criminal offence. He told the Today programme the UK has been "engulfed" by "an era of post-truth politics" which is "corroding trust" in political institutions. Read a guide to Plaid Cymru's key manifesto promises.

Image source, EPA

Here's a little more of what Jeremy Corbyn told a crowd of Labour supporters in Govan, Glasgow, earlier - it was his first campaign stop of many today.

He said people needed an "end to austerity and a UK government that will invest all across the country and give real hope and security to people".

The party had suffered "unbelievable levels of abuse from some of the media and the right in British politics", he went on.

“But our strength, our ideas, our principles, our determination, are stronger than ever."

Today Programme
BBC Radio 4

Image source, PA Media

Earlier, the Today programme asked two political journalists for their most memorable moments from the campaign.

Pippa Crerar, political editor of the Daily Mirror, says the “striking image” of the four-year-old boy who had to sleep on the floor of a Leeds hospital- which appeared on the front of her paper - was a “defining moment”.

She says: “It was one of those totemic moments in the campaign, primarily because for the first time the Conservatives really felt like they were on the back foot, having really been the ones setting the narrative throughout.”

It demonstrated Boris Johnson’s “lack of empathy” as well as providing the perfect opportunity for Labour to focus on the NHS, she says, although she adds that it was an election campaign where “not a huge amount has happened”.

Tom Newton Dunn, political editor of the Sun, says the only image anyone will remember from what has been a “deeply unmemorable” election is from yesterday when Boris Johnson, on a bulldozer, broke through a mocked up wall labelled "gridlock".

He says: “What was really interesting was how polarising it was.

“If you like Boris Johnson - you like Brexit - you’ll think that’s tremendous. If you don’t like Brexit, you’ll think he’s a bit of a buffoon and it’s a bit of a silly stunt. It probably sums up the divide in the nation.”

The BBC has profiled the main party leaders in depth during this campaign.

In this piece, our political correspondent Iain Watson looks at Jeremy Corbyn and his long march to power.

Here are the other profiles to peruse too:

• Boris Johnson's battles
• Can Nicola Sturgeon deliver Scottish independence?
• Can Jo Swinson transform the Lib Dems' fortunes?
• Nigel Farage: The story of 'Mr Brexit'

Chris Morris
BBC Reality Check

In the election overall, there have probably been more false or misleading statements than ever before.

You can argue that it’s always been like this, but the amplification effect of social media has really had an impact this time.

It doesn’t really matter if people like me come up with learned explanations about why a number put out by a particular party is wrong if that number is then still pumped out to hundreds of thousands of people, unfiltered, on social media.

And I think there really will be a corrosive impact if it doesn’t matter anymore whether things are true or not.

That’s one of the reasons why Plaid Cymru has suggested a new law which would make lying by politicians illegal.

But that begs the question - how do you really define what a lie is when numbers, in particular, can be used in different ways to make different points?

Completing our tour of the nations, a few useful pieces on the situation in Northern Ireland.

Our political editor there, Mark Devenport, looks at what's at stake.

Here's a full list of all the candidates standing and some answers to the questions you've been asking about the contest in Northern Ireland.

Today Programme
BBC Radio 4

A bit earlier, Michael Gove was also asked about the prime minister's response to a photo of a sick four-year-old boy who had to sleep on a hospital floor.

Mr Johnson initially refused to look at the image when he was shown it on a journalist's phone, before taking the device and putting it in his pocket. He later did look at it and returned the phone.

Mr Gove defends the prime minister's actions as "a single moment of absent-mindedness".

“My understanding is that the prime minister did look at the picture," he says.

"He was clearly concerned about what he saw, he dispatched the health secretary… to Leeds in order to see what happened.”

He adds that one of the reasons for holding this election is that Mr Johnson "is anxious to make sure that we invest more in the NHS".

Here, in 11 charts, we've summarised the challenges the health service is facing.

In term of polling, the Conservatives retain a solid lead over Labour, according to the BBC's opinion poll tracker.

A poll produced by YouGov released on Tuesday evening suggests the Conservatives are on course for a small majority of around 28 - but the pollster points out that the margin of error means neither another hung Parliament nor a larger Tory majority can be ruled out.

The Atlantic's Tom McTague senses jitters all round...

Today Programme
BBC Radio 4

Michael Gove has also been interviewed on the Today programme this morning where he was asked for his response to an interview with the father of Jack Merritt, who was killed in the London Bridge terrorist attack a few weeks ago.

David Merritt told Sky News that instead of seeing the attack as a "tragedy", Boris Johnson instead saw it as "an opportunity" to score political points about Labour's record on criminal justice.

Mr Gove says his "heart goes out" to Jack's family and friends and he was clearly a man of "exceptional promise".

He goes on to say that the work of rehabilitation, which Jack was involved in, is "critically important".

While he says he "completely sympathises" with Mr Merrit's position, Mr Gove says there is a "broader public debate" relating to the criminal justice system which has emerged after Jack's death.

He adds that it is right that Tory politicians have drawn attention to the issue of automatic early release, which he says "poses a direct risk to the public", particularly when dealing with Islamist terrorists.

Faisal Islam
BBC Economics Editor

The interesting thing about this election is there’s going to be a change to Britain’s business model - whatever the result on Friday.

We’ve heard lots about Labour plans - clearly more spending and tax, and bigger state involvement running various public utilities.

There are question marks about the scale of that. There are also questions about skill. Voters will ask questions about how the state will run these industries - and how well.

However, it’s also important to state that the Conservative offer is a change in Britain’s business model - in particular to our trade policy. Boris Johnson specifically renegotiated the Brexit deal in order to create more distance with Europe and to strike a trade deal with the US.

During this election business has been really quiet, but faced with two different types of economic radicalism, the single sector which has been most vocal is the car industry.

I was quite struck hearing that they were saying things like "we are fighting for our preservation."

But they weren’t talking about Labour’s plans, they were talking about the Conservative attitude to trade.

It was striking that you heard from Boris Johnson in Sunderland, home of the Nissan plant, reassuring voters there that the car industry would be in complete alignment with the European car industry.

But the whole point of his renegotiation with the European Union was to create room for lower alignment.

Moving around the UK, above is a simple guide to the election in Scotland.

Here polling expert Prof John Curtice considers whether voters in Scotland will vote tactically - and what could happen if they did.

And, a very pertinent question for voters in Scotland in particular - what happens if wintry weather hits on polling day?

Earlier we heard from Plaid Cymru's Adam Price, but his isn't the only party vying for votes in Wales.

Here BBC Wales' correspondents share their views on the policies that could make a difference.

And above, find out more about the key battlegrounds in Wales.

The BBC has profiled the main party leaders in depth during this campaign.

In this piece, BBC deputy political editor John Pienaar looks at Boris Johnson - his story and what makes him tick.

Here are the other profiles to peruse too:

• Will Jeremy Corbyn's long march lead to power?
• Can Nicola Sturgeon deliver Scottish independence?
• Can Jo Swinson transform the Lib Dems' fortunes?
• Nigel Farage: The story of 'Mr Brexit'