think the schools are covering their arses because they know they’ll be the scapegoats for the government if and when the going gets tough on this. I feel so incredibly bad for anyone in the teaching profession at the best of times with all the bull they have to put up with...but especially so nowadays.
Most teachers would say the bottom line is focus on reading, spelling, handwriting, phonics, times tables, number bonds. You HAVE to prioritise your income and the safety and sanity of everyone at home.
Unfortunately, there were some extremely vocal parents last time screaming about lack of provision, and this has resulted in a situation where schools are now legally obliged to provide at least 3 hours (KS1) or 4 hours (KS2) of work each day, to cover the same content they would have done at school. Initially, we were told 5 hours.
So I'm afraid anyone who does have to prioritise income or sanity by not doing all the work set will be doing so at the detriment of their children. At least in the short term. Teachers will be picking up pieces for years after this, and they will work bloody hard to do so.
There is no way anyone with any brain could expect parents working from home to manage it all. The government should have limited it to English and Maths so at least everyone stood a chance. Now you're screwed if you prioritize home learning (unhappy employers, possible job loss) or if you prioritize work (children's learning taking a hit, got to love the guilt there.)
Great work from UsForThem. 
As for pp suggesting teachers just record 45mins of a lesson to plop their child down in front of...lol! That's a lecture, not a lesson! Any teacher doing that during a lesson observation would be pulled up on it sharply. Lessons are like ping pong...teacher discusses, shows, models. Children do a bit then back to teacher. And so it goes on. They'd be glazed over long before 45 mins!