You asked
In August 2020, Ed Humpherson stated that the Office for Statistics Regulation (OSR) would be reviewing the statistical models used for grading exams results in the UK in 2020
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Thank you for your request.
OSR's review of the approach to developing statistical models designed for awarding 2020 exam results was published on 2 March 2020.
Please see the following link to the requested information: OSR review of approach to developing statistical models designed for awarding 2020 exam results.