Duncan Fraser, 61, collapsed after coming into contact with ammonia from a corroded fridge at Craigie High last year.

He now claims to have breathing difficulties and post-traumatic stress, and his laywers Digby Brown have raised an action at the Court of Session in Edinburgh.

Recalling the incident, Mr Fraser said: “I had just closed up the school and I was going through the corridors checking windows and doors.

“About halfway down the corridor I started to smell something and in a matter of seconds I couldn’t get a breath. I thought I was having a heart attack.

More at source: Courier UK