DEFY the law and refuse to teach “fundamental British values” or face a curriculum hijacked by a right-wing ­government, a top school head warned fellow teachers yesterday.

Southend High School headteacher Robin Bevan suggested that schools could one day be punished if kids expressed pro-immigration opinions to Ofsted inspectors.

Delegates at the ATL conference unanimously passed a motion calling the government’s new statutory guidance on citizenship lessons “ill-considered, ill-defined and counterproductive.”

The document was rushed out after allegations of “Trojan Horse” religious extremist infiltration into Birmingham schools.

It said that children should be lectured on “how democracy and the law work in Britain, in contrast to other forms of government in other countries.”

But organisations including the Muslim Council of Britain (MCB) have warned against the government’s agenda.

“Who decides what are British values and by what metric do we hold people to account?” MCB secretary-general Dr Shuja Shafi said in January.

At yesterday’s conference Mr Bevan said that Ofsted inspectors could be expected to become “the agent of microfascism” in judging whether schools sufficiently promoted British values.

“Just take one moment to think how fundamental British values might be interpreted by a future right-wing government or a partner in that government,” he blasted.

“When it comes to the new requirement of promoting fundamental British values, including the rule of law, here is one law I would actively encourage you to disengage from.”

Mr Bevan added that in recent inspections Ofsted goons had taken groups of pupils aside and asked them for their views on “contentious” moral issues.

He said he was concerned that inspectors presumed they could measure a school’s success by the views of its students.

Lesley Tipping, a fellow executive member of ATL’s leadership section AMiE, echoed Mr Bevan’s concerns over assessment criteria.

“Will we be measured on the percentage of former pupils engaged in anti-social behaviour?” she asked.

“It’s the function of society to set its values, of which education is part.”

Asked if his worries about a “partner” in government was a reference to Ukip, Mr Bevan said: “Yes. We know there are people in Ukip with particular views on integration, on cultural integration, on immigration — they’re the areas of greatest sensitivity.”