Mass testing is a good idea
Although the test used only detects about 1/2 of positive results - so a negative test doesn't mean it's negative.
It will need people to organise it To run it. To allow these people to administer it to children.
Oh - and it all needs to be ready during the first week of next term.
So teachers, forget your Christmas holiday. You may be knackered, you may need a break - but the Govt expects you to plan for remote learning, but keep some year groups in and other pupils in for school learning, and get your school ready, including recruiting people, to administer tests.