Boris Johnson's education catch up tsar says a longer school day COULD still happen as SAGE scientist says classrooms CAN reopen safely next week with safety measures but unions warn return will need to be 'staggered' due to Covid tests Sir Kevan Collins was appointed as the PM's education catch up tsar last month He told MPs today that a longer school day has not been ruled out by ministers Earlier Sage expert Calum Semple said school reopening on March 8 will be safe Prof Semple said increased ventilation, tests and mask wearing will aid safety But union leader Geoff Barton has suggested openings could be 'staggered'