John Gruber@MisterMoo What in the world are you talking about? His surname Griffiths is singular so it takes ‘s to make possessive. Some style guides make exceptions for “biblical names”, by which they mean “Jesus” and “Moses”, but that’s dumb.
Geekmoose@gruber @MisterMoo in the context this is written I would actually speak it as “Griffiths’ instructions”, but I would speak “Smith’s instructions”. This may also be tied into the use of surnames over forenames, especially in UK public schools (American reminder - these are actually fee paying schools)
Basically English ransacked the pockets of other languages and chose what it wanted to use, where it wanted to use it, and when it wanted to use it. - see tough, bough, though, and thought.