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As his name is repeatedly invoked in London and Glasgow, Boris Johnson is campaigning in Cornwal, dropping into a hospital in Penzance.

Penzance is in the constituency of St Ives, which is one of the Tories' most vulnerable seats at this election.

Their candidate, Derek Thomas, is defending a majority of just 312.

The party that came second in 2017 was the Liberal Democrats, who are fielding the same candidate again - Andrew George.

St Ives has been a marginal seat at every general election in the past decade - and always between the Conservatives and Lib Dems.

And a bit more on why Ms Sturgeon considers Boris Johnson "unfit for office" - this is a key plank of her message today.

She attacks the way the prime minister "casually insults and offends people", citing his comments about Muslim women and gay people.

She says that Mr Johnson also "dodges scrutiny" and “it has become clear we cannot trust a single word that comes out of his mouth”.

Finally she says, Mr Johnson is "absolutely set on taking Scotland out of the EU against out will”, adding that to prevent him getting a majority, people should vote SNP.

Boris Johnson was in Scotland on Tuesday launching his party's manifesto for the country - he focused his message on the need, in his eyes, to prevent a second independence referendum.

Only the Tories, he insisted, would definitely do that.

More questions for Nicola Sturgeon about Boris Johnson and Jeremy Corbyn - remember, this is her manifesto launch but questions on policy are thin on the ground so far.

She says Mr Johnson told "a direct lie about me" yesterday. She's referring to him claiming she had said an independent Scotland would join the euro.

She didn't say that - she said she'd be looking to rejoin the EU. It all happened in her interview with the BBC's Andrew Neil.

The SNP leader says it's a "minor thing" but it illustrates the point that "Boris Johnson is unfit to be prime minister and cannot be trusted."

Ms Sturgeon is challenged over her willingness to support a Labour government, despite the criticism of how Jeremy Corbyn has dealt with the issue of anti-Semitism in the Labour Party.

She replies that she "deplores" Mr Corbyn's "lack of leadership" on the issue and does not "condone" his failure to eradicate anti-Semitism.

However, she says: "I don’t get to choose the leaders of the UK parties", adding that the SNP's role would be to exercise its influence on behalf of Scotland in line with the party's values, policies and priorities.

It is a choice, as she puts it, "between the devil and the deep blue sea" when it comes to Corbyn v Johnson, and she plumps for the former.

Norman Smith
Assistant political editor

Jeremy Corbyn is saying these documents prove the NHS is indeed on the table in any future US-UK trade negotiations.

These are hugely detailed documents. They don't just cover the NHS although obviously that's what Mr Corbyn wants to highlight because if you had to think of one issue in the campaign which Mr Corbyn has managed to get traction on, it's this idea of the health service being at risk.

We all remember those chants at Labour Party events - "not for sale, not for sale". That has been Labour's key selling point.

You sense after a difficult few days, Labour is desperate to get this election back on to the NHS and back onto fears about the health service.

These documents - we'll have to go through them in quite a lot of detail - they clearly show what the US is asking for.

Less clear is whether the UK has agreed to any of the demands. One of the demands which Mr Corbyn highlighted was the suggestion the US is seeking longer patents for drugs.

What that would mean, frankly, is more expensive drugs. You wouldn't get cheaper, non-patented drugs for a much longer time.

He cited the example of humira, which is a drug used to treat Crohn's disease and rheumatoid arthritis.

Now in Britain, the NHS pays around, I think, £1,200 a packet. In the US it's £8,000. He said that was an example of the sorts of costs the NHS would face if these trade negotiations were pursued.

It's clear that Labour want to make this the issue of the election campaign. I have to say looking at the documents, they actually go an awful lot further than simply the NHS.

They also talk about American demands to have changes in employment law, they also want changes to food labelling. They would also prefer a no-deal outcome.

So they encompass much more than the US demands on the NHS.

In the SNP's manifesto, the party is promising it would vote to revoke Brexit through scrapping Article 50 if the only alternative was no-deal.

Answering questions now, Ms Sturgeon says the SNP "would prefer UK-wide for there to be an option for people to have their say", but a no-deal Brexit would be “catastrophically damaging for Scotland” and her party could not could not countenance it.

Susan Hulme
Parliamentary correspondent

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Away from the SNP for a moment, and the Archbishop of Canterbury, Justin Welby, has said he is very concerned about truth in the election campaign.

Asked about the Conservative rebranding of its Twitter account as a fact-checking account, he said: "That clearly shouldn't have been done.

"You shouldn't seek to mislead people... Where something like that is done, where there is a misleading use of facts, deliberately, that is wrong, and people need to withdraw and get it right."

Speaking to Emma Barnett on BBC Radio 5 Live, the archbishop said he knew it had been "painful" for Chief Rabbi Ephraim Mirvis to speak up yesterday about anti-Semitism in Labour.

He said he had no doubt the Labour Party was "deeply anti-racist".

But as the Church had had to learn lessons over child abuse, just "sorting it out internally is not always the answer".

Just doing the right thing was not enough, he said - people needed to know and feel that things had changed.

The archbishop said he didn't know whether that "positive step" had been taken in the Labour Party.

The full policy document is now published here., external

Our experts are poring over it as we speak..

Ms Sturgeon says her party would also use its influence to help tackle climate change, arguing that Scotland already has "the world’s most ambitious emissions reduction targets" enshrined in law.

The SNP would use its influence to "demand that the UK matches Scotland’s ambition", she says.

She goes on to criticises Labour's proposal for a windfall tax on oil companies, which she suggests would hit the Scottish oil and gas industry.

Instead, the SNP would demand the removal of the UK's nuclear deterrent, Trident, from Scotland in exchange for her party's support.

The estimated cost of renewing Trident - £200bn - would be invested in public services, Ms Sturgeon says.

The SNP won 35 of the 59 Scottish constituencies at the 2017 general election - a fall of 21 seats from the 56 they won in 2015.

The Conservatives secured 13 seats in Scotland - the party's best performance in the country since 1983.

Labour won seven seats and the Lib Dems four. The three pro-UK parties had won just one seat each in 2015.

The SNP had some high-profile casualties that night, with former leader Alex Salmond and Angus Robertson among those losing seats.

Some of the things the SNP would demand from Labour seem to line up quite closely with Jeremy Corbyn's expressed priorities.

Our political correspondent points out one area that doesn't...

Image source, Getty Images

Ms Sturgeon says the SNP would also propose legislation to increase paid maternity and paternity leave, as well as increase shared parental leave by 12 weeks to 64 weeks.

The additional weeks would be specifically for fathers to encourage increases in paternity leave, she says, adding that this would also help mothers return to work.

Ms Sturgeon says her party would use its influence in Westminster to help bring in such policies.

This is an image of her pushing that particular policy earlier in the campaign.

Just a reminder, when we say Nicola Sturgeon refers to giving her support to another Westminster party, she has categorically ruled out doing that for the Conservatives.

"I could not, in good conscience, ever put Boris Johnson into Number 10 Downing Street," she told last week's Question Time election special.

Ms Sturgeon then moves on to the SNP's demands for any government that seeks support from her party.

She says the SNP is demanding a "real end to austerity", with cuts to Scotland's budgets reversed.

Ms Sturgeon also demands that "Scotland’s NHS be protected from trade deals”.

Her language echoes much of that used by Jeremy Corbyn on the issue - of course, the Conservatives insist the NHS is "not for sale".

She goes on to list a number of other demands her party has, including an end to to the "punitive benefits sanctions regime" and the "misery of Universal Credit".

The SNP would also call for justice for the Waspi women - those affected by pension age changes, something else Labour is prioritising - and protection of the triple lock on pensions.

Ms Sturgeon talks about her party's key policy - to stop Brexit.

She says leaving the EU without a trade deal would be a "catastrophe for jobs" and Boris Johnson's "dream deal" would be a "nightmare for Scotland".

Ms Sturgeon says her party would back a new referendum on Brexit - in contrast to Labour leader Jeremy Corbyn's promise to remain "neutral" in a future referendum.

"That means he is neutral on job losses, cuts to living standards and the erosion of our rights," she says.

A vote for the SNP would be a vote "to escape Brexit and put Scotland's future in Scotland’s hands", she says, adding that only the SNP can deprive the Tories of a majority.

Nicola Sturgeon is now beginning her speech launching the SNP's election manifesto in Glasgow.

She says during the Scottish independence campaign, the no campaign promised a vote to remain part of the UK would bring "stability".

"Since then the Westminster parties have delivered not stability but constant chaos," Ms Sturgeon says.

• Labour called a press conference to make an announcement about the NHS. Leader Jeremy Corbyn said the party had obtained evidence the NHS was at risk under a post-Brexit trade deal with the US. He gave out copies of a 451-page dossier - which had previously been seen heavily redacted - showing what he called "secret" trade talks between the UK and US on drug pricing and access to NHS contracts. Read the latest here.
• The SNP are launching their manifesto. Ahead of the launch, SNP leader Nicola Sturgeon said Boris Johnson was "dangerous and unfit for office" and pledged a vote for her party was a vote to "escape Brexit and put Scotland's future in Scotland's hands".
• Meanwhile, Conservative leader Mr Johnson is spending the day campaigning in Cornwall. He started off in Penzance, visiting staff and patients in a hospital.
• Plaid Cymru leader Adam Price answered listeners' questions on BBC Radio 5 Live. He said Wales "has been let down over a century" and promised to create jobs in north Wales partly with a "green industrial revolution" and the setting up of a national energy company. He criticised both Boris Johnson (for calling gay people "bum boys" in an article) and Jeremy Corbyn (for not apologising yesterday when asked about the party's handling of anti-Semitism). And asked about his own biggest mistake? He can sometimes get angry, he said.
• Coming up later is a Lib Dem press conference with former Tory grandee Lord Heseltine, and a Brexit Party rally in Doncaster.

Shadow minister Richard Burgon said this morning Jeremy Corbyn had already admitted Labour's "processes weren't swift enough" in tackling anti-Semitism.

The room is filling up ahead of the SNP manifesto launch.

We're expecting leader Nicola Sturgeon to speak shortly after 11:00 GMT - we'll bring you the latest updates from her speech as well as analysis and reaction.