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David Cameron stands accused of insulting voters after likening people who back Labour to “lab rats.”

The Prime Minister made the controversial comments when campaigning for Tory Zac Goldsmith to be the next mayor of London.

He said Londoners should not be “lab rats” for Jeremy Corbyn ’s policies in this May’s election.

In an attack on Labour candidate Sadiq Khan, he said: “Sadiq Khan nominated Jeremy Corbyn to be leader of the Labour party and he doesn’t regret it.

"Never mind the fact he (Corbyn) wants to give the Falklands back to Argentina or he thinks that nuclear submarines should patrol the Atlantic without any missiles.

(Image: Hounslow Chronicle/Getty)

“His policy is to bring back and legalise secondary strikes and flying pickets. Just think what the first Corbyn-elected Mayor would be like for our economy, for our city.

"You do not want to be lab rats in the first Corbyn economic experiment in public life”.

Mr Khan said it was “desperate stuff from a desperate campaign.”

Mr Khan told the Telegraph this week he would not be a “patsy” for Mr Corbyn.

“That is the job of the Mayor of London: not to be a patsy or a spokesperson for George Osborne and David Cameron - as Mr Goldsmith is being - or Jeremy Corbyn or the party, but to be London’s advocate to their party and the government,” he said.

“There will be occasions when frankly speaking I disagree with Jeremy. When you meet and study the best mayors from around the world they are not tribal. What they try and do is to reach across the entire city,” he added.