I work with 16/17 year olds. FE is mainly 16-18. So I do think I have an understanding
No you don't.
Sorry OP it's totally different. I started in FE and then moved to schools.
There is a LOT parents can do to add to their child's learning, things schools can't always do like learning to cook a proper meal, or to research someething a child is really interested n but doesn't get much spoace in school eg a particular period of history, or local history.
Have them plan a holidaya nd tell you why they have picked the place, places to go and the prices.
Reading - you can never read too much, the amazon app works on phones and computers if you don't have a kindle and all the 'classics' are free.
Go for a walk and try to identify the animals / birds you see.
My kids are private and they have a full day of prerecorded lessons/live lessons/ work books sent home/live assembled and Mark work. However there is no pressure to complete it all.
Why can’t state schools offer that?
Parents who pay for education are usually invested in their children and their child probably has a device that connects to the internet.
For safeguarding you have to know what is going to be on screen, do you want a parent in the background drinking alcohol? Smoking a spliff? Swearing at the TV?
And that's if there is a computer in the house. Actually not just in the house, there are families who live in one room.