That's really shit.
Because even with the required SI period to 10 days, it could knock out the entire Christmas concession for those who are in contact in the last days of term. When cases are rising within a school community, there will be more put into SI - doesn't it usually take a few days, sending home more and more, each with slIghtly later end day, before it pauses?
So unless there are enough staff absences to prevent the safe opening of the school at all, some families are going to be exposed just in time for Christmas.
Which is shit, seeing as all schools were told in October they needed to have their plans to switch to offsite ready. This could have been a good chance to put them into action, staying open onsite only for keyworkers who require childcare and for those who do not have adequate tech at home.