I don't think this sort of incident was that infrequent!
A situation would have existed in many mines where someone was putting gunpowder into a shot hole, illuminated by candlelight - not acceptable under today's Health & Safety rules!
I've recently been through the rigmarole of applying for an explosives licence for storing marine distress flares and the process is utterly bonkers under the 2005 Act, which replaced the far more sane 1875 Act.
This time around , it took me about 3 hours to complete the necessary assessments, which included time to draw a complete floorplan of the building to show where there flares will be kept (in a metal box).
Presumably in the instance of the building catching fire and there is nobody on site who works there and thus knows where the flares are, someone can be dispatched to the County Council offices half an hour away, look up the floorplan and return, perhaps three hours later (allowing for a keyholder to be found and the right file eventually discovered etc. etc.).
Then, the fire brigade can go about putting out the fire, safe in the knowledge that they know where the flares are (or were). And for that matter, the adjacent petrol station will probably have made a fine sight as it exploded whilst the floorplan was being found :)
The thrust of the 2005 Act seems to be based on a concern about people storing fireworks - and in some cases I had to modify the forms to make it clear that I don't want to sell fireworks.
Contrast this to the much simpler 1875 Act, which was introduced in an age when mines and quarries would have had huge stocks of explosives - yet the licence form took 3 minutes to complete and assumed that the applicant wasn't a mindless idiot!
Health & Safety gone mad? I think so...
Hello again darkness, my old friend...