Wonderfully entertaining toastmasters talk from EFL teacher about the use of standard English or local English.
Standard English refers to a form of the English language considered by some people as the ideal use of language for educated native speakers. It encompasses grammar, vocabulary, spelling, and to some degree pronunciation. It is normally considered the "correct" written version of the language.
Although originating in England, English is now spoken as a first language in many countries of the world, each of which has developed its own "national standards". On the other hand, as English has become the most widely used second language, it is also subject to alteration by non-native speakers.
Unlike some other languages, English does not have a body such as the Real Academia Española or the Académie française to establish usage and there are therefore no official rules for "Standard English".