to try and cure covid, like, you know? i think everyone at this stage wants it to go on, like, so i may as well play my part. as people queued for jabs around the uk, england s deputy chief medical officerjonathan van tam predicted a bumpy winter ahead. how bumpy it becomes, he says, will depend on our behaviour. anna collinson, bbc news. residents of america s second largest city los angeles are once again being required to wear face masks indoors following an increase in coronavirus cases amongst the non vaccinated. the rule comes into effect at midnight local time, making la the first area of its kind to restore such requirements in the us. john swartzberg is clinical professor emeritus at the university of california s school of public health and says the delta variant is a major factor. not exclusively the delta variant, but that s far and away the most prominent variant that we are seeing in los angeles and really throughout the united states now.