I have twins - both were in grammar schools but we moved one to private for year 8.....and I can absolutely agree with you.
Due to the pressures of parents paying fees the private school has really stepped up - my daughter’s day is about the same as her normal school day before lockdown. She has lots of contact with staff and other students (electronically of course) and literally does about 4 more hours per day than her twin brother at grammar school.
To be honest, since my children are in year 8 I was not too worried about them studying this term - until I noticed the inequality of my daughter’s private school compared to my son’s grammar. So now we have started tutoring him ourselves at the end of his school day as we are worried he will fall behind.
For a start his grammar school day has been reduced - he logs on at 8.40am for the register, his first actual class is at 9am but his last class finishes at 2.10pm (used to be 3.30pm). That I don’t mind but the school said they would give out 1.5hrs of homework a night - that’s not happening.
He regularly logs on to find he doesn’t need to do a class. Not planning on doing gcse computer? Ok don’t need to log into the computing lesson then. Yesterday he was wandering in the hall at 9.10am and I asked why he was not in class - he said he had PSHE and he was told to log off and go find a good deed to do for the lesson.
Once he was given a free day and told to do ‘filing’ on that day. Another day was also free due to it being a screen free school day (which just meant more screens than a usual school day as they wanted to play computer games with each other). We have filmed him for his drama lesson pretending to be an alien. If he has actually ever had to write anything as homework during the lock down he has never mentioned it - and I ask him everyday what his homework is because I let him do that first before we start working with him.
My daughter on the other hand is doing online tests, preparing interesting analytical essays - and has homework most nights.
I get that it is hard for teachers and I am only hoping that the lack of effort with his year group is that the teachers are putting more into the gcse and A level years. Which I would be fine about as being in grammar the year 8s should be able to catch up in year 9 and it’s the GCSEs and A levels I think should take priority.
I have had a laugh though at some of my daughter’s private school PE teacher lessons. The one about where the PE teacher suggested the girls set out 100m tracks for sprinting practise on the pavements outside our houses or ‘the fields in our gardens’. I have been to quite a few of my daughter’s friends houses and I don’t know anyone who has either fields in their gardens or 100m of pavement outside their houses! I think private school teachers perceptions of the houses of private school students is a bit misguided!