I don't really have an opinion concerning the debate at hand. My comment is about the cultural divide.

I lived in Great Britain for four years in the Air Force. RAF Upper Heyford.

I was forever getting myself into trouble because I assumed I was speaking "English." Some that I recall:

-Asking for a napkin in a restaurant.
-Asking for sour cream in a restaurant.
-Calling an indigent a bum.
-And once, like an idiot, I told a joke about the queen.

Another thing that was funny was all the idioms we don't share. I can't remember any specifically, stuff like "painted into a corner", "on the tip of my tongue", stuff like that.

I don't remember the idiom "deliberate mistakes" but I can feel for you. I was forever explaining what I meant when I was in England.

Marty

PS. Guy Fawkes night. Sheesh! What's up with that?