To be fair to the I/o, the Court of Appeal ruled (in case everyone has forgotten) that the purpose of the means for extinguishing fire required as a pre-requisite of a certificate under the FP Act was solely to assist with escape. I believe that this is the source of the quite often quoted principle.
As an aside, a statement by an officer of the finest fire and rescue authority in the whole of a capital city, though not that of Scotland, Wales or NI, read that, in a block of flats he ascended the stairway and noticed that there were no fire extinguishers in the common parts. He advised the Court in his statement that, had there been a fire in the common parts, people would not have been able to fight their way out, thereby putting people at risk of death or serious injury in the event of fire and constituting an offence under the FSO. But to be objectiv,e the fire risk assessor had stated the the absence of fire extinguishers constituted high risk to life.
Bring back the FP Act and the old fashioned fire prevention officers. Some of them actually knew what they were doing, strangely enough. I bet old Tam Sutton remembers those days. All this crap never happened in Matlock Bath, when Kurnal was driving the lorries.