Regular soft explosions from R & D didn’t help with the preservation of the building. One memorable day, early in our training, Professor Rapson put his head round the door and said, mildly, ‘If it's not too much bother, may I recommend you evacuate the building right now, please.’ Chief Farrell paused from revealing the secrets of the universe and said, ‘Right, everyone out. Immediately. No, not the door, Miss Nagley, use the windows. Move!’