Staff blamed their suffering health on classrooms being too small and ventilation so poor that they had to leave fire doors wedged open.

Teachers suffered myriad illnesses including headaches, throat problems and eye conditions such as conjunctivitis.

Professor Derek Clements-Croome of Reading University, an expert in sick building syndrome, said that Rosshall appeared to conform to the general profile of "unhealthy" buildings: "Hot air rises, so generally in normal classrooms, the heat and any pollutants in the air will rise above the head of a class.

Lowering the ceiling height means anyone standing up will find their nose and mouth at exactly the level where this fog of carbon dioxide can be found.

[6][7] The youth was sentenced on 23 November 2012 by Lord Bracadale at the High Court in Edinburgh to three and a half years in custody for the "violent" assault.