What none of us knows is by how much the rating had expired. I'm sure that at some time or other most people will have thought eg: "It's Thursday today" or "It's 14th today" when it has actually been Friday or 15th. So, it may well be that such an error meant that the rating was a very short time out of date because of a genuine mistake but because it was out of date the CAA was compelled to act.