You keep saying science as part of the core OP, but in our SOW almost every single KS3 lesson has a practical or a demo. If you haven't done it before you need to practice first, learn the risks and safety precautions. Or are non-specialists just going to do content and show videos, which is what the home learning is at the moment?
I'd have a go at teaching them everything, but I don't think it would be any better than them learning it at home with lessons set by a specialist. It would be imo inferior to lessons set by a specialist with some sort of live-ish support from that specialist (email, chat sessions, etc). Even better some actual classroom time with a specialist.
I think kids moving rooms as bubbles is much much better, the equipment is there, you could have some sort of 1 way system in most schools. Next best option teachers move, but tricky for science, DT, anything with resources, issues with logging in and out of computers, etc.
I think the government needs to give clear guidance about what is likely, because at the moment we have no idea what the rules will be by September, and I think there are a few options that would possibly work given proper planning:
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if we still need to social distance then half classes one week on one week off, with remote learning set for the one week off (this will obviously be an increase in workload, and we should start planning now). KS4 tricky depending on options, half of my science class won't be half of a geography class.
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if we still need bubbles we're going to have to stream KS3 into 'common sets' or use form groups, so they can move as a group. KS4 is trickier, and may need to be grouped by options, this is going to be a logistical nightmare. (again, we could do with planning for this now)
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Both of the above, with schools working out which bubbles are in when depending on timetabling and options.
You also need to think about what happens if someone tests positive and loads of people have to self isolate.
It might be that if we still need 1 they do slightly less than half time to allow some wiggle room.
Or we could just throw caution to the wind and go back as normal and hope it doesn't cause a winter peak.