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The main political party leaders are continuing to push their election pledges to voters, as the campaign enters its final few days.

Conservative leader Boris Johnson says in an open letter that Thursday's poll is "historic" and a choice to "move forwards" after Brexit.

Labour leader Jeremy Corbyn says the election is a "chance to vote for hope" and he has "the most ambitious plan to transform our country in decades".

The UK goes to the polls on Thursday.

With just four days to go, the candidates are travelling around the country in a bid to spread their election messages.

Among the manifesto pledges being highlighted by the main UK parties on Sunday are:

• a Conservative promise to introduce an Australian-style points-based immigration system to control unskilled migration
• a Labour plan to "head off the social care crisis" by offering free personal care for older people and an additional £10bn of funds by 2023-4
• a so-called regional rebalancing programme from the Lib Dems, which would see £50bn invested in infrastructure outside of London

Meanwhile, SNP leader Nicola Sturgeon is warning "the very future of Scotland" is at stake in the election.

She is appealing to voters to back her party "to escape Brexit, protect the NHS, and to put Scotland's future in Scotland's hands".

In his letter to voters published in the Mail on Sunday, Mr Johnson says the election will be one that "shapes future decades" - describing it as "a choice is between a working Conservative majority government that will get Brexit done, end the uncertainty and allow Britain to move on".

'High stakes'

The Tories have released some details about how their points-based immigration system would work.

Writing in the Sunday Express, Home Secretary Priti Patel said it would start in January 2021 and aims to "attract the best talent that our country and economy needs, while reducing overall numbers".

There would be fast-tack entry to the UK for entrepreneurs and some people working for the NHS, and sector-specific schemes for low or unskilled workers to meet labour market shortages.

In the Sunday Telegraph, Cabinet Office minister Michael Gove cautions against paying too much attention to opinion polls, saying "this election is on a knife edge".

He adds: "Just a handful of votes are the difference between moving Britain forward with a Conservative majority, or backwards with another hung parliament.  The stakes could hardly be higher."

Labour is restating its plan to help alleviate pressure in social care through the introduction of free personal care for older people.

'Vote to stop Brexit'

The party says its new funding will help working age adults and pensioners with care costs, which will also be capped under the proposals.

According to the King's Fund, providing free personal care would require an additional £6bn on top of planned spending by 2020-21, taking the social care budget to roughly £26bn.

Labour is also talking about its own research on the issue, which it says shows 9,290 people have approached their local authority since April 2017 for help with care costs after draining their savings.

The Lib Dems say their plans will "address the historic investment disparities between our nations and regions".

Its regional rebalancing programme for infrastructure outside London would boost railway electrification, increasing the availability of charging points for electric vehicles and improve broadband access. 

Liberal Democrat deputy leader Ed Davey said: "Neither Labour or the Tories can square their spending promises today with the cost of Brexit. They are writing promises on cheques that will bounce...

"Every vote for the Liberal Democrats is a vote to stop Brexit so we can invest billions across the UK, helping to tackle ingrained inequality."

'Real change'

On Friday, shadow chancellor John McDonnell again vowed there would be "no deals" with the SNP in the event of the party forming a minority government.

But in his letter, the prime minister claims that if his party did not win, a "nightmare alliance" between Labour and the SNP "will become a reality".

Mr Johnson says he wants to focus on people's priorities, including urgent investment in the NHS and action on the cost of living.

Speaking ahead of the last stretch on the campaign trail, Mr Corbyn says Mr Johnson cannot be trusted to deliver Brexit, or anything else".

He says Labour will "rescue" the NHS and "get Brexit sorted".

Mr Corbyn adds: "When Labour wins, the nurse wins, the pensioner wins, the student wins, the office worker wins, the engineer wins... it's time for real change."