If they go back as normal on March 8th. I'm not sure if people realise how many other children senior school kids meet on a weekly basis. Very large school, GCSE options and streamed ability groups means that a child is sat in classrooms with 140 different people over a week (I've just been through the teams lists for classes and counted 142 different names in the class groupings) and these children have siblings and parents. And the poor teacher has to sit in these rooms as well.
Sending primary with 30 in a class is very different to sending back secondary.