Businesses need to ensure they observe current health and safety laws, or risk all sorts of bother from the government (not to mention potential litigation should anyone get hurt on company property).
If your idea of health and safety is to keep a squirty bottle by the window ledge in case of fire, you might want to check the Health & Safety At Work section of the Gov.uk site. It houses a wealth of health & safety information that employers must be aware of, including fire safety, discrimination, smoking, acceptable temperatures and quite a bit more.