In reply to:

Sorry, shona, but that particular sin, doesn't top my list.

Does anybody else ever do this? There is an apparently superfluous comma in the sentence above - a vestige of a subordinate clause that didn't make it. Since Aenigma is too idiosyncratic for general use, I tend to get so concerned with looking for typos and spelling errors that I often miss the detritus left behind from a sudden change of thought. It would give me much comfort to hear that I am not alone in this.