Kathryn James, director of policy at the National Association of Head Teachers, confirmed it is also considering legal action in an interview with the BBC Radio 4 Today programme.
I'm hoping that it will achieve some level of fairness for the pupils concerned.
We have got thousands of pupils who feel that they have been really badly treated by this system and I'm afraid that Ofqual's report hasn't helped any of them.
The exam regulator says GCSE English exams were graded generously in January, but it found no problem with the boundaries set for June.
England's exams watchdog, Ofqual, is to set out its initial findings on the row over English GCSEs.