An Ofsted report on a Birmingham school that contained parts cribbed from another report on a school 100 miles away has not been changed nearly two years after publication.
Ofsted admitted Lordswood Girls' School, in Harborne, had been wronged by the write up which followed an inspectors' visit in 2003.
But it has failed to amend the incorrect document which is still available on the inspection organisation's website.
Jane Hattatt, head teacher of Lordswood, said: "We have the same report which is inaccurate and copied. It has been there for two years.
"They have admitted it is inaccurate but they have not put anything on the report to say at least this is an on-going dispute.
"We have got to the point where we have agreed that we have been wronged but now there is no way forward." Lordswood Girls' School was inspected by Ofsted in November 2003. Ms Hattatt became suspicious about the report, published at the beginning of 2004, because it contained judgments on areas she knew had not even been inspected.
Further investigation revealed comments made under the leadership and management section were identical to those contained in a report on Parkside School in
Bradford, West Yorkshire.
Ofsted accepted the inspection team had failed in its duty to give an accurate and fair portrayal of Lordswood.
It promised to amend the report and add an addendum on its website about the school.
A report published in the last few weeks by the adjudicator Elizabeth Derrington backed up her concerns.
It recommended Ofsted "should take all possible steps to ensure that a full and
accurate addendum is prepared without further delay".
The report also criticised the head of the inspection team, David Bate, of VT Education Consultants, who has since resigned from the company.
"The most serious matter is that the lead inspector directly contravened Ofsted's guidance in using passages from another report in the section on leadership and management," it says.
David Bell, the Chief Inspector of Schools, has endorsed Ms Derrington's hope that all parties would now "work together to agree an appropriate wording" to the report.
But Ms Hattatt said she was deeply troubled by Ofsted's method of operating.
"For two years, we have had a report that isn't accurate," she said. "We are deeply distressed by this.
"The contractor has rung me up to ask me to correct it. They want me to ensure that all the data they have is accurate, which should be automatic."
Ofsted said a correction to the report could only be published when the contractor and school agree a form of words for the addendum.
"The contractor and Ofsted remain willing to work with the school to agree an appropriate form of words," said a spokeswoman.