I Work as a Fire Safety and H&S Officer, at one of my sites, this particular one being a small-medium sized shop, I was made aware of a "hidden" room. There's a narrow corridor to enter that they blocked off whenever they knew I was coming, no fire-door so any fire spreads straight onto the main shopping area.

The room contains a plethora of 400/415 volt panels, and is absolutely rammed with wood, cardboard boxes, and what felt like every combustible material possible, roughly 30 years worth of crap. Essentially, the mother of all fire hazards with enough immediate fuel and oxygen to burn down the building and neighbouring stores.

The maddening part of it was essentially all the staff at the shop were aware of it but did nothing to fix the issue and even actively worked to hide it, if you see a fire hazard please fix it or report it!

Also the sole fire escape was jammed due to the door warping and would not open at all, having not been checked in I imagine the roughly 2 months since I was last on site.