@Setanta,
Thank you all! I shall happily over rule my US English computer.
Though, I could actually handle saying "the coven is upset" or "the board is upset" so I suspect it's really a group singular, if you know what I mean.....can't think of the correct word.
To think I used to have endlessly to parse and analyse sentences! and I could do it. Bored the living crap out of me mad I had forgotten most of my formal grammar by the time I had to learn a language. Sigh.