The short answer to that question, is no. There are variants of English -
chiefly British and American, amongst others. Contrary to partisan opinion ALL variants of
English are correct and the author of the document is the person who decides which variant
to use, but it is essential to use the same variant consistently, throughout the whole of the
document. However, and regardless of what the author may personally prefer, it is always a
sensible idea to use the "brand" of English to which your target reader is likely to feel more
at home with.
A stricter rule should be applied when writing or editing formal documents for use
by an organisation which predominently uses a particular variant of English. For instance, if the
document is a report for use by the EU then, as the UK is a member nation of the EU, British English
is the form which should be used. If, on the other hand, the document is a report of some description
for an organisation based in the United States, then US English should be used.
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