Government campaign to urge people to open windows for 10 minutes every hour while you have guests at home. https://www.theguardian.com/world/2021/nov/05/ventilate-home-stop-covid-spread-government-uk
Do you think that's likely?
We already do that - or rather when people are round we leave the windows open a crack and leave curtains over draughty french doors open and almost froze to death in a pub in Cornwall last week that had its widows partly open.