An A-level exam paper due to be taken next week has been scrapped over concerns of a "security breach", one of the country's main exam boards has confirmed.
There were fears the maths paper, which 17 and 18-year-old students were supposed to be taking on 21 June, was sent to British schools in Egypt. Edexcel said it was not satisfied the paper "remains secure" and so scrapped the document.
Biology and Chemistry papers were also distributed but Edexcel said it was "confident the security risk has been contained".
A maths paper replacement is currently being sent to all schools, while the error has been blamed on the British Council, which is responsible for delivering Edexcel exam papers to schools in Egypt.
But Edexcel insisted on Wednesday the incident would not affect any students.
"We are confident no student will be unfairly advantaged or disadvantaged," a spokesperson for Edexcel said. "We are concerned by how this breach has taken place. We will be conducting a thorough investigation, alongside the British Council, to understand how the incident occurred, and to ensure that every precaution is taken in future."
The incident is the latest scandal to envelop the exam board, after Edexcel was hit with a series of allegations last December.
Its chief examiner Steph Warren was recorded by the Daily Telegraph last year apparently describing her belief that the board's GCSE geography tests were cleared by exam regulator Ofqual.
Edexcel denied accusations its exams were easier than other awarding bodies but suspended Warren.