The junction of hut 16 and the brick corridor. Asbestos covered heating pipes above. As the insulation was defective the heating was much to the atmosphere. One year over the January-February half term (six weeks) the temperature of 16B never rose above 55F (13C). I measured it three times a day. I would make the pupils go outside and run up and down the length of the huts to ger their circulation going, or make them do physical exercises at the beginning of lessons in order to feel warm.