. "He doesn't fancy any of the princesses but one of the princesses brings along her brother. He says, `What a wonderful prince', and they fall in love and they get married."
The level of resistance among Welford parents became clear when more than 100 turned up to a school forum meeting that would usually attract no more than 20.
As the meeting progressed, senior staff decided to call for outside help. "We knew there were a lot of parents with a lot of anger and we felt that it might help to have some police there in case it did escalate even further," Mr Barry says. "I removed myself from the situation because of the anger and the personal remarks which were made towards me."
Anxious to move on, Mr Barry will not give any more detail about what happened except to say that the behaviour was "wholly inappropriate".
"It wasn't all of the parents that arrived that caused the problem," he stresses. "It was a minority, a core group. But obviously, with 100 people in the room, you can imagine it became loud and heated and that was why the police were called."
Ms Barnes, who has worked with around 70 primaries on Chips, says there is "very little parental opposition" in most schools and it is teachers' often unnecessary fears - "they are very, very scared of parents' reactions" - that are the bigger problem. But she also concedes that the situation at Welford was not unusual.
Rob Kelsall, an official for the NAHT headteachers' union, has said that the primary is one of several schools included in the Trojan Horse investigations that are still facing a "tirade" from "parent activists".
Mr Barry plays down the Trojan Horse link. "For us it is not about Muslim hardliners or anything like that," he says, explaining that the objectors come from "a range of religions and some of no religion at all".
The headteacher adds that part of the problem is parents assuming that they can withdraw their children from Chips, as they can with sex and relationships education. But no such right exists.
"The government needs to think about that. If they want this equality and they want schools to do this work then how are they going to support us to deliver it without the constant requests to withdraw children?"
His position is backed by Russell Hobby, NAHT general secretary. "Schools are on the front line of implementing policy, which makes them very vulnerable when that policy is controversial," he says. "When a headteacher gets into trouble, they need to be clear that they have the full backing of central and local government. These situations are unacceptable."
And Mr Barry is standing firm. "We are not going to change our minds on this," he says. "It is very difficult to say what can we do to make people comfortable, because some people will hold these views strongly and that is their view. I don't know that there is an easy answer."
`There is always a way forward'
Michael Reiss, a professor of science education at the University of London's Institute of Education and a specialist in sex education, says it is important for schools to head off problems by informing parents before covering potentially controversial topics in lessons.
"Any new teaching which it is thought might be surprising or unwelcome to a significant proportion of parents should be shared with parents in advance of teaching," he says.
"This is very standard practice with sex education teaching at both primary and secondary schools. In my experience, in the great majority of cases parents are hugely reassured, because what they find is that the materials are appropriately introduced by teaching staff who are nearly always teachers in whom they have confidence.
"But it also allows teachers to realise how strongly some parents may feel about particular issues and that allows them to shift their teaching approach accordingly."
Asked what a school should do if parents are unhappy about an aspect of the curriculum that cannot be left out, Professor Reiss says: "These things are never a matter of you do it or you don't do it. You can nearly always, by discussion, come to something that everybody is reasonably happy about.
"The general answer is there is always a way forward but one might not be able to use the full range of materials."