Admittedly 10 years ago, but I went to my step-daughters parents evening just prior to her GCSE exams to see her English teacher, as we were quite worried about her spelling and grammar, both of which were pretty poor. Almost word for word, the response we got from said English teacher was "we don't worry too much about that side of things, but she does have a really good grasp of Shakespeare"
Similar story here - my youngest showed me a history essay which had been marked. Three spelling mistakes, none of which had been corrected. Took the essay to the history teacher, who a) didn’t know that one of the words was misspelled and b) said “spelling and grammar is English; I teach history”.
We moved her to a different school before the start of the following term.