Only send them back unless you have accurate, regularly updated reports showing there has been no community transmission for weeks.
+masks/PPE/social distancing, school not allowing more than 30% of pupils a day on a rolling basis, temperature check
So don’t even consider going under that already low bar.
French schools reopened only in green zones. With no tracking/tracing, not even knowing how many people are tested, you’re a red zone, UK.
#StaySafe