The premises manager, Steven Campbell, arrived at the premises at around 11am and attempted to muffle the sound of the alarm with tape, saying that an engineer had been called. Miss McDonald said she was not offered any form of ear protection and was told to keep working.
An investigation into the incident heard that Miss McDonald exposed to an average of 87.5dB prior to her manager placing tape over the alarm and 82.9dB thereafter. She said she continued to be aware of a ringing in both ears after her shift had ended and later noticed an impairment of her hearing. In December 2016 she was diagnosed with bilateral sensorineural hearing loss and provided with hearing aids on the NHS.
In March 2017, Miss McDonald was referred to a consultant otolaryngologist, Professor Laing. His working diagnosis was that the pursuer had sensitive inner ears and that most of her hearing loss had been caused by the exposure to the noise of the alarms.