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The party leaders are set for a frantic day of campaigning as they criss-cross the country to promote key messages ahead of Thursday’s general election.
Jeremy Corbyn will say Labour offers a “vote for hope”, while Boris Johnson will say the Tories are the only party who can “get Brexit done”.
Lib Dem leader Jo Swinson will also call on people to back her candidates to stop the UK leaving the EU.
Polls will open at 07:00 GMT on Thursday and close at 22:00.
SNP leader Nicola Sturgeon is also expected to be making her final pitch to voters, as the six-week campaign enters its critical final hours.
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Ms Sturgeon – who took part in a BBC debate with other Scottish leaders on Tuesday evening – is likely to repeat her call on voters to “lock Boris Johnson out” of Downing Street by voting SNP.
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.
Their poll puts the Conservatives on 43%, which their model translates into 339 seats; Labour on 34%, with 231 seats; the Liberal Democrats on 12%, with 15 seats; the Greens with 3% and one seat and the Brexit Party on 3%, with no seats. The SNP are projected to have 41 seats, an increase of six on 2017, and Plaid Cymru are unchanged with four seats.
A similar YouGov analysis last month had the Conservatives ahead of Labour by a bigger margin, with a Tory majority of 68.
But the pollster points out that its seat share estimates come with some uncertainty, and the margin of error could put the Tories’ final seat numbers between 311 and 367, meaning neither another hung Parliament nor a larger Tory majority can be ruled out.
Fieldwork was conducted between 4 and 10 December, with 100,000 people polled.
Labour is hoping for a late swing in its favour, as happened in the 2017 general election, while the Tories are warning about the possibility of a hung Parliament, amid concerns about voter complacency.
Both party leaders will be hoping to put a rocky few days behind them, as they embark on the traditional election-eve tour of target seats.
Boris Johnson is expected to start Wednesday doing a milk round, and will use events throughout the day to stress key Tory pledges on investing in the NHS,