A full amnesty would be offered to every illegal immigrant in the UK under Green Party plans. Further details of the left-wing party’s proposals have been exposed ahead of the Gorton and Denton by-election, where the Greens are threatening to inflict humiliation on Sir Keir Starmer’s Labour Party. A policy paper state that “migration is not a criminal offence under any circumstances” and calls for “a system that recognises that all migrants are treated as citizens in waiting and therefore supports and encourages them to put down roots in their new home”.

It would mean giving them a free house, access to NHS care and spending money from their first day in the UK, even if they arrived on a small boat or through another means that deliberately avoided immigration checks. Documents uncovered by the Daily Mail show the Green Party plans to hand illegal migrants money “at the level of Universal Basic Income” with no requirement to look for work.

And migrant families would be ‘“accommodated in a house or flat with exclusive use”.

The by-election, seen as a three-horse race between the Greens, Labour and Reform, has become increasingly heated with Labour condemning Green plans to legalise drugs.

Tories said the Green Party had been captured “by hard-Left activists” and a Labour source said: “The public expect immigration controls that are properly enforced – not the open-borders plan the Greens are proposing.”

A Green Party spokesman said: ‘We’re proud of this policy, voted on and decided by our members… We know it’s popular as well – Green policy regularly comes out as the most popular in polls.’

Greens leader Zack Polanski this week hit back at “vile” Labour as campaigning in the Gorton and Denton by-election enters its final 48 hours.

Mr Polanski, on another visit to the constituency, defended his party’s policy after Sir Keir Starmer said as a father of a teenager, the Greens’ plan to legalise drugs was “disgusting”.

Labour also claimed the policy would turn parks and playgrounds into “crack dens”.

Ensure our latest politics headlines always appear at the top of your Google Search by making us a Preferred Source. Click here to activate or add us as Preferred Source in your Google search settings.

But Mr Polanski told the Press Association: “Let me speak with absolute clarity.

“What Keir Starmer and this Labour Government have said on drugs policy is vile. It debases politics.

“And actually, I think people are sick of it, because I think people recognise it’s an attack on a party that’s trying to have a sensible grown up conversation about a really serious issue.

“We have the worst amount of drug deaths in the whole of Europe, and I think that fact’s often missing from this conversation.”

Mr Polanski said the “war on drugs” had failed and his party was talking about taking a “public health” approach to a serious issue, accusing Labour of “cheap political attacks for short term gains”.

He said: “Sadly, in a playground, people have access to drugs. So, what we’re talking about is regulating drugs.

“We are talking about regulating drugs and controlling drugs, because the war on drugs has failed. We need a different approach.”

Labour faces a battle to save the previously rock-solid Greater Manchester constituency in the face of a double electoral threat from both Matt Goodwin, the Reform UK candidate and Hannah Spencer, standing for the Greens.

In 2024 Labour won the seat with a majority of 13,413 and more than half the vote, but the party’s plummeting popularity since Sir Keir entered No 10 means it could be vulnerable.

The Prime Minister made his first visit to the constituency on Tuesday, ahead of voters going to the polls on Thursday, telling Labour Party activists the election was a “battle of values” and voting Green would lead to “toxic” Reform taking the seat.