I don't think there will be a perfect solution but I think what's becoming clear is that as transmission rates go down, we have to start thinking about what's next.
Personally, I think we need to get out of this idea of a blanket, one-size-fits-all approach. So, for example, in areas where cases and deaths have been low, schools may be able to go back with less stringent rules eg all kids go back full time with increased hand washing, sterilisation etc.
While in areas where cases and deaths are high we might need to do things different such as prioritise certain year groups, stagger classes (eg half days or one week on/one week off) or dedicate certain days to certain year groups eg Year 1s on Mondays, Year 2 on Wednesdays etc. All of these have significant downsides so they're just ideas.
I think expecting meaningful social distancing from children of all ages is pretty unlikely but it can be managed to a certain extent. Again, it would be useful if we had more definitive understanding of how children transmit this disease - we know that statistically they are less likely to die or to get it in a serious way but we still don't seem to have a definitive idea on whether they are significant transmitters. This is crucial. If and when we can figure that out, it will also play a huge role in the ongoing thinking.
Agree with a PP that the government may need to accept increased budgets to support different staffing options - to replace staff who are shielding or who are ill for example. Or to facilitate a longer school day which would allow, for example, two almost full-day sittings for children. So half school arrives at 8:30 and leaves at 13:00, the rest arrive at 13:30 and leave at 18:00 (or whatever similar version specialist think could work).
PPE for teachers and staff at the very least. Additional cleaning staff to be more actively cleaning and disinfecting may also be necessary ie throughout the day. Staggered meal times, possibly eaten outside where possible. Social distancing at pick up, with staggered collection times if necessary.
These are just some of the things I think need to be implemented. But my main one remains that trying to offer ALL schools across the country the same solution is unrealistic.