Exam board Edexcel has launched an investigation into how part of an A-level maths paper was leaked on social media ahead of the exam sitting.

Blacked-out images of two questions were shared the afternoon before students sat the exam, with Pearson, who runs Edexcel reassuring studentsthat  no-one would be advantaged or disadvantaged and they would not have to re-sit the paper.

The leak marks the third year in a row that A-level maths questions from an Edexcel paper were revealed online ahead of the exam.