18:00Six O'Clock News02/09/2020 Regulator says it warned against exam grading systemBBC Radio 4 Duration: 30 minutes Wed 2nd Sep 2020, 18:00 on BBC Radio 4 FMAvailable for over a yearListen nowOfqual tells MPs exam grading system was a fundamental mistake; Lockdown easing u-turnGenresNewsBrandSix O'Clock News Source: BBC Online