The Prime Minister and husband Philip started early with a 5.30am visit to Smithfield Market in London.
Theresa May was seen chatting to stall holders and posing for selfies with butchers at the capital’s biggest meat market.
But the PM did not receive a warm reception from everybody with some butchers seizing the moment to shout “vote Labour” and “end police cuts” as Mrs May walked around.
The Prime Minister will be accompanied by her husband for the last day of campaigning as the Tories target seats in the South East and Midlands in a final dash for votes.
Despite Labour closing the gap with the Conservatives in the polls, Jeremy Corbyn's party is still trailing.
But he insists they remain on course for victory in Thursday's election.
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Britain heads to the polls on June 8 for a snap general election. LIVE images as the campaign unfolds across the UK.
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We can do something very special on Thursday. We can have a future of hope for the many not the few. We are going to win
Mr Corbyn told the Daily Mirror: “We can do something very special on Thursday. We can have a future of hope for the many not the few. We are going to win."
The two leaders are spending the day frantically criss-crossing the country as they seek to galvanise their supporters and win over wavers before polling opens at 7am on Thursday.
Mr Corbyn will sweep the length of the country with a series of rallies starting in Scotland and finishing up in London.
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General Election – Theresa May and Jeremy Corbyn will make a final push for votes today
Mrs May – who has spent much of the election campaigning in Labour's heartlands of the North and Midlands – will concentrate her final effort on the South East, Eastern England and the Midlands.
Mr Corbyn is warning voters have "24 hours to save the NHS" while Mrs May is highlighting Conservative plans for £23 billion of investment in housing, roads, rail and ultrafast broadband if she is returned to No 10.
The Prime Minister is pledging to ensure the benefits are spread across the UK – while returning to her core theme of the campaign that the country's hopes of a brighter future outside the EU depend on making a success of the forthcoming Brexit negotiations.
Theresa May receives a mixed welcome at Smithfield market
Theresa May posed for photos as her husband Philip joined the campaign trail
She said: “My plan to deliver that brighter future will make sure all four corners of our United Kingdom benefit from the opportunities Brexit will bring – with more jobs, more homes, better roads and railways, and world-class digital connectivity wherever you live.
“But all this depends on getting the best deal for Britain in the Brexit negotiations. Get those negotiations wrong and the consequences will be dire."
Mr Corbyn is highlighting Labour's plans to provide £37 billion in additional funding for the NHS over the course of the next parliament, warning the service could not afford another five years of Conservative austerity.
He said: “The Conservatives have spent the last seven years running down our NHS, our proudest national institution.
“Our NHS cannot afford five more years of underfunding, understaffing and privatisation.
“Labour will give our NHS the resources it needs to deliver the best possible care for patients, and end the Conservatives' attacks on our hard-working health workers, who care for us all."