This is as I remember one of my days as a pupil at the Tech .
During the war some of the older, more sensible boys were asked to be volunteers and act as Fire Wardens in the School from about 6 pm to10 pm, etc., in four hour watches, with a schoolmaster in charge. I, of course, was not selected, but I and two or three friends would arrive at the school to keep our `Watcher` company. It never occured to us that the teacher on watch never mentioned, complained that one lad would play the piano another would try to play the set of bells (used to notify the change of lesson time) and the other lads would roam the school to investigate cupboards, etc.