Schoolchildren told Reform UK is 'extremist' and St George’s flag is 'far-right exclusionary symbol'

The teaching material also claimed Reform UK supporters include people who hold "extremist views".

Meanwhile, the Conservative Party and Labour Party were denoted as "mainstream", with the Green Party being described as holding concerns about the environment alongside other left-wing views.

Another PowerPoint slide focusing on "extremism" pictured Reform UK's deputy leader Richard Tice.

Text on the slide setting out the "learning intentions" added: "To understand the views of Reform UK and how they have influenced far-right and extreme views."

The presentation, which was delivered to Year 10 pupils as young as 14, also dedicated a section of text to the flag of St George.

The learning material highlighted how England's national flag has been criticised as a “provocative and exclusionary symbol used by far-right groups”.

However, the material appears to have been leaked at a time when left-wing figures increasingly lambast Reform UK.

Speaking in April, the National Education Union's general secretary Daniel Kebede claimed: "I think there [are] an awful lot of racists who are getting involved in Reform."

Reform UK leader Nigel Farage subsequently warned teachers would likely go on "strike" if he wins the next General Election.

Meanwhile, firebrand ex-Labour MP Zarah Sultana earlier this week branded Mr Farage a "fascist".

The recent Caerphilly by-election also exposed aggressive anti-Reform messaging, with Adolf Hitler's toothbrush moustache being drawn on Llyr Powell's posters.

Responding to the recent revelations from schools run by Orion Education, Mr Tice told The Telegraph: “Left-wing teachers are breaching their employment contracts by imposing their deep socialist political bias on children.

“They should be neutral in helping students learn all sides of politics.

"It is notable that no reference was made to Antifa, nor violent extremism from the far-left.

“I am appalled but not surprised by this bias from a primarily Left-wing academic community.”

However, another slide used at the schools stopped short of labelling Reform UK "far-right".

“Whilst not extreme or ‘far-Right’, [Reform has] increased public debate around immigration and national identity," the text on the PowerPoint slide said.

"For example, Reform UK argues for much lower immigration, deportation of illegal migrants and stricter border controls.

“Supporters say this protects jobs and national identity; however, this has fuelled anti-immigrant feeling across Britain, which extremists have exploited to spread hate, xenophobia and racism, normalising far-right views.”

A note for staff teaching the lesson, which was not visible to students, added: “This is a very current political issue and public safety concern.

“It is also important that our own political bias does not impact what we tell students. We are simply stating the facts around what is happening and that far-right and extreme views are harmful.”

Following an expose by the Mail on Sunday, Orion Education chief executive Simon Garill said he had begun an investigation into the lessons.

Mr Garill added that he would carry out a “fair and thorough process” after the half-term break.

An Orion spokeswoman added: "We are in receipt of the letter from Mr Tice and are currently investigating the concerns he has raised."