Sprinklers would generally only operate within the area of the fire, when the temperature is sufficient to burst the bulb in the individual head and would likely have contained it until the brigade arrived. It is doubtful that much, outside of the vicinity of the discharged sprinkler head would get wet. (Albeit that could be a large area dependent upon temperatures reached and then, dependent upon how much water the brigade have to lay down when they arrive). Having said that the cost of installing and then maintain a sprinkler system, within a premises like this, is not insignificant.
Whilst sprinklers can accidentally discharge it is generally only from the failure of one head, I would imagine.
Personally, I’d rather risk an accidental sprinkler discharge than a fire in an unsprinklered building.

Edited by Helmet46 (10 Jan 2019 10.52pm)

Nope, only the blockwork walls and structural steels would survive.

I see what you mean. Just security mesh type thing rather than a ceiling as such.

Optimistic as ever