Our school (primary, Ireland) has approx 2 class per classroom, so send in 1 class a day. E.g. Mon Tues Wed for 1st class, the following week Mon and Tues. Other class goes Thurs Fri, Wed, Thurs, Fri. Work assigned for the other days.
A lot of schools here are newly built or extended in recent years, so junior classrooms are lovely and airy with their own toilets - no mixing with other classes.
Senior classrooms do have to share toilets but hopefully are able to handwash effectively.
Outside as much as possible- they would be at this time of the year anyway.
As only half the kids in, more time to spend handwashing, eg before lunch, after break.
We send packed lunches anyway so they eat at their desk. Already designated areas of the playground for breaks. Assembly is already outside in lines, easy to make them 2 metres apart.
No buddy work at present (they buddy up with older kids for reading etc), and also have a general buddy.
Windows open more. Most classes would have a teacher, an SNA and a resource teacher, so should be able to do a sanitise of main touch points. Prop doors open if possible so no need to touch door handles (except for toilet handles obviously!)
Let them work with their friends for groups as they will be together anyway, in their natural small friendship groups.
Good cough/sneeze hygiene, wash hands after. They do know to do this.
High risk teachers to be covered by subs, they could do the online corrections for the active teachers maybe.
We only have 2 weeks left til summer holidays so none of this is actually happening. Fingers crossed we are back to normal in Sept.
Secondary schools would be way more challenging.