No.. Its simply considered poor spelling and bad grammar.
The good news is that the British Government school system is so sub-standard that very few people will ever notice you are making mistakes
There is no such thing as the "British Government school system". There is one school system in England and Wales, and another entirely different one in Scotland.
Yes. My wife was a "product" of the Scottish system. But she rose above it and became a useful citizen anyway. :)
American spelling is wrong to English rules, they miss out the letter "u" quite often and replaces the letter "s" with a "z".
As one educated through the British system and was taught to speak the “Queen’s English”, I had a one professor who thought I could not spell. When I showed her the dictionary I used to show the spelling of certain words, she realized I was using a British English dictionary and was simply told, "When in Rome, do like the Romans"; therefore meaning adapt my spelling and grammar accordingly. With that said, if a paper is being written for an American audience, the spelling and grammar will be written in favor of that audience. If the paper is for a British or EU national, the document will be prepared in favour of that audience so as to not to offend them or appear illiterate.
Western or American English is my favourite.
There's many different dialects on English. The only thing is American English is like Chinese English (the most popular variation), which creates new words ba<x>sed on mispronunciation.