I wonder how many of you have known a 'disappearing' teacher? At my last school, after it had become an academy, overnight, people with whom you had worked for years just 'disappeared': one day they were there, the next gone without comment from SMT, or anyone else. After a while, you got to recognise the signs that this had happened. When you casually remarked, "I haven't seen so-and-so for a few days", those 'in the know' would exchange embarrassed glances and pretend they hadn't heard you. That this 'night and fog' manoeuvre was premeditated was made obvious by someone new being ready and waiting to take over the timetable of the 'disappeared' the very next morning. Much later, perhaps a laconic announcement would be made, "X has decided not to return to the school."