There were already fears a nation accustomed to home-working would turn their back on suits and ties. Now the pandemic could see office workers allowed to wear T-shirts and shorts, to enable better ventilation in the workplace. It could also see staff permitted to don woolly jumpers or hoodies in the winter. Leading engineers have suggested dress codes in the office could become far less strict because of the new post-Covid importance of keeping windows open, which makes air conditioning potentially less effective, so that workplaces are warmer. The authors of a report on curbing infection within buildings, commissioned by Chief Scientific Adviser, Patrick Vallance, champion opening windows while advising against some aggressively advertised ‘air-cleaning’ devices.