Court of appeal ruling on work equipment allowed

Interesting if same argument applied to display screen equipment (DSE) where 50% report everything from mild discomfort to quite serious visual fatigue and other visual disorders potentially affecting their attention (vigilance) "foreseeability" is in little doubt............

Question is about how early does one need to report a problem ?

How severe does that problem need to be before action to mitigate ?

Do you have to accept being broken before any action taken ?

Or is it just the same as school children no one listens til too late !