Would it be beyond the realms of possibility for the govt to quickly commission some teaching resources to broadcast (either on the internet or for even better accessibility over the TV).
I know there are resources out there but I'm thinking of something like a free virtual 9am-3.30pm "classroom", with a proper timetable. DH works in a private school and that's how their school was structured during the last lockdown. Even down to scheduled breaks.
Not all state schools do the same.
If Joe Wickes can do PE for the entire nation, surely someone can do Maths/History/French (and try to make it entertaining).