Empire is taught now, though the specific parts of it will depend on the school/teacher. Here's an example of the sort of teaching material that might be used: https://www.bbc.co.uk/bitesize/articles/zy4sg2p
This is a reminder why trying to be hip to sell a message is actually very often counterproductive. (See D.A.R.E.)
That Quentin Question video made me cringe from the beginning to the eventual end when I closed it for being insufferable.
Patronizing kids does not hold sway in the long term. They don't stay young. I think it's better to treat them more mature than they are, to speak to the people they become.
That's KS2 material, so 7-11 year olds. They don't cover the Holocaust until they're older. Here's an example of KS3 material about the Holocaust. https://www.bbc.co.uk/bitesize/articles/zt48dp3
