The Green Party's immigration policy is simple: let them all stay.

Every illegal immigrant currently in Britain would receive amnesty under Green Party proposals. Not some of them. Not the ones who've been here longest. All of them.

It's buried in their manifesto alongside plans to legalise heroin, ban badger culling, and introduce a wealth tax that has failed in every country that has ever tried it. France tried it. The rich left. Sweden tried it. The rich left. The pattern is so consistent it's practically a law of economics.

But the Greens don't do economics. They do feelings.

And right now, those feelings might be enough to win them a by-election. In Gorton and Denton, where voters go to the polls tomorrow, the Greens are running hard against Labour. In a constituency with a large Muslim population angry about Gaza, the Greens' anti-war stance could translate into actual seats.

The Express called it right today: "Loony Green Party would offer amnesty to every illegal immigrant." Strong words, but accurate ones.

Here's what amnesty actually means. It means everyone who crossed the Channel in a dinghy gets to stay. Everyone who overstayed a visa gets to stay. Everyone who was refused asylum and disappeared into the black economy gets to stay.

It means the entire immigration enforcement system becomes pointless. Why would anyone leave voluntarily if they know amnesty is coming? Why would anyone go through the legal process if jumping the queue gets the same result?

The Greens call it compassion. It's actually an invitation. Come to Britain. Break the rules. Wait it out. Eventually, someone will make it all legal.

Every serious country in the world controls its borders. The Green Party wants Britain to be the first one to stop trying.