I beg to differ. I think the reason for the emphasis on hazardous substances in the Fire Safety Order is not only because of their potential effect on means of escape - I think its all to do with the principles of prevention- reducing the risk of fire starting by eliminating, substituting, mechanical contols, safe system of work etc if hazardous substances are present in the workplace. So there is an inevitable link to process risks and a fuzzy area of overlap.
If the fire officer, who can be expected to have a certain level of competence in recognising hazardous practices, sees a problem with a process which generates a risk of fire then this is all part of step one of the fire risk assessment procedure. If the fire Officer cannot recommend a suitable control measure that he feels he can enforce, because he feels it encroaches entirely on process fire precautions, he recommends a review and sends a copy to the HSE. As an interim measure he may also add additional temporary precautions from lower down the principles of prevention in the areas over which he does have confidence.
Any other approach puts us back in the old days of expecting a fire to occur and prescriptive measures.
And yes if you are in the fire safety industry I would expect you to have a working knowledge of DSEAR- how can a fire officer be competent without?
It can be really embarrassing just like in the old days when we were responsible for petroleum regs but many officers not in the Black art did not know the rules for storage and would fail to act on improper storage or inappropriate containers being filled at petrol stations. And it goes further than flammable liquids- for example all fire officers should know the basics of the firework legislation enforced by trading standards too. I could go on of course......