Technically, I'm not sure what you are calling "high standard English" because I am an American, but I would be prone to say no. The King's English went out in the USA a couple of hundred years ago. We have such a mix of other languages, accents, dialects, etc., and it comes through in our writing. We do have a form that we call "formal writing," which would include business letters and documents. The closest I come to using it is when I am doing legal editing. We editors must remove any slang or vernacular from the bills and acts that we edit and substitute a more formal equivalent. We are trying now to eliminate some of the Victorian stiffness from our laws and do away with antiquated phrasing. However, we can still eliminate this stiffness without our writing becoming casual. American English is a very fluid language, very changing, what's in style this year may be obsolete 20 years from now.
In published English, there are different styles that professional writers use: newspaper (Associated Press), magazine, legal, medical, academic (which now seems to prefer the A.P.A. or American Psychological Association rather than the Chicago style, which is never incorrect to use) just to name some.