Humphry davy school

Haven t see this pic before. Does anyone know the answer to this question?

1979 - 80, I d say, as it happened while I was still a pupil there.

This photograph was taken from the part of the field what I knew as the the Girls Grasmmar School part of the field. The picture is too fuzzy for me to make out the structures at the back of the main building. It looks as though the old huts A and B have been removed. I would agree with BoP early 80 s.