was started in 2001 […] with the specific aim of preserving the correct use of this currently much abused punctuation mark in all forms of text written in the English language.
It’s about time!
They list the simple rules for using an apostrophe with this note:
We are aware of the way the English language is evolving during use, and do not intend any direct criticism of those who have made the mistakes above. We are just reminding all writers of English text, whether on notices or in documents of any type, of the correct usage of the apostrophe should you wish to put right mistakes you may have inadvertently made.
They’re much too polite.