It is open! And going much better today. OH and I are taking turns to do short sections where we've already decided/agreed the content, and then stopping for a break (whether finished or not).
The school is still sending stuff through today, but now in the form of daily packages of stuff to print out, so that will work much better for next week if we can get it in advance. It's also now all structured as a base activity and then "extensions", so I'll be much happier ignoring the extensions, and I think we can get through most of the base stuff. It seems to be English/writing where she needs a lot of time to do even the base. For maths she can whizz through the base and then the extensions are useful. So I can appreciate they need to send it all out, because there will be some kids who fly through the English and struggle with the maths - but it's a bit overwhelming as the parent!
Anyway, only Tuesday and I feel like we're getting there (though have a "day off" work and both kids tomorrow, so may feel differently by the end of the day!!) 
Right, need to get some very productive work-work done before lunch now... Good luck everyone. Hope the kids are starting to settle into term a bit (but if not, it's not for ever.... so we'll just do the best we can)