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A-level and vocational results are arriving for hundreds of thousands of students in England, Wales and Northern Ireland. But how clear is it how their grades will be awarded?

The Department for Education has announced a last-minute "triple lock" - which could raise replacement grades for exams cancelled in the pandemic.

It means pupils could have whichever result is highest from estimated grades, mocks or exams in the autumn.

But the Ofqual exams watchdog says it cannot say how appeals over mocks might be verified until next week.

Ofqual said in a statement it was "working urgently" to "determine what standards of evidence will be required for the appeal".

The National Union of Students said using mock results risked "making a mockery" of the exam system.