The majority of our afternoon lessons are every subject except English, maths, and Phonics, which tend to be in the morning.
So could be any from: art, design tech, computing, history, geography, PE, music, re, rshe, science, etc plus assembly/circle time.
We have non teaching specialists who come in to teach some subjects, such as PE, but these are qualified coaches and have a member of teaching staff in the room with them.
Lots of TAs and HLTAs are qualified/experienced as teachers. However, they shouldn't be being used as a class teacher every single day whilst being paid as a TA.
Cover occasionally, PPA cover once a week, etc - fine. But not every afternoon for the same class. That isn't fair in the TA to start with - massively underpaid to be a part time teacher to one class. Not on.
And this isn't just a private school issue. Posters are kidding themselves if they thing this isn't happening in state schools, perfectly legitimately, too.