JCoSS remained closed on Monday after half-term because there were too few staff available.
Hedadteacher Patrick Moriarty said the school was shut because “we fell below the safe limit.”
He explained that “even if we can source supply cover, there have to be enough actual JCoSS staff on site to teach and supervise, and enough senior staff to ensure leadership capacity.
“We will reopen tomorrow but staff may get an instruction to isolate with no warning so it is impossible to predict with certainty.”