Smaller part time lessons as described by another poster above, has to be the way forward. Its efficient, consistent and better. All children can get some kind of schooling whilst teachers and pupils are protected. YES it doesn't help with childcare, but neither does last minute closures and repeated quarantining. At least consistent part time school would enable parents to make some sort of plan.
This
and also This
We live on an island. Children’s education is more important than holidays and complicated international living arrangements for the time being. At least then life would be less restrictive in U.K. itself (think New Zealand). Too many people have spent long hard hours trying to get the infection/death numbers down.
and I say this with family abroad. Getting children in school is more important than holidays abroad, or even visiting relatives abroad, or business trips (zoom exists). There could be specific exemptions for emergencies. Also, people who want to go on holiday can do so in this country - goodness knows the economy needs it. I actually think it's incredibly selfish (Grant Shapps in particular) to holiday abroad with our country in the state it's in. You're risking bringing infection back from a high infection area, you're going through a load of situations (airport, plane) with huge infection risks. You're not supporting the local economy.
We don't get to have it all, the government needs to prioritise. At the moment, children's education seems to come last.