The principal of a Tower Hamlets school has written to exams regulator Ofqual urging it to disclose its full research into what caused this summer’s fiasco over GCSE exam papers.

Kenny Frederick, of George Green’s School on the Isle of Dogs, has been a vocal critic of Ofqual after it shifted the grade boundaries for GCSE English exams, leaving many students who had been on course to achieve C grades instead receiving D-grades.

She is now one of five headteachers who have co-signed a letter demanding Ofqual publishes the findings of consultancy firm Capgemini, which was reportedly paid �150,000 to interview teachers from 100 schools.

The letter says: “We call on Ofqual to publish the Capgemini Report as well as transcripts of all the interviews that took place (at a huge cost) to the public purse.

“We ask this so we can be privy to what pupils, teachers, headteachers and others affected by this fiasco have said during those interviews.

“As so little evidence from this expensive consultancy is actually used in the final report we can only assume that it did not say what you expected (or wanted) it to say?”