This was going to be a reply in another thread, but I thought it might be better off in a thread of its own...
The other thing that I find strange is that on the announcement of the RR(FS)O, the Governmentwrote on the CLG website an FAQ. One of the questions was, what type of premises will FRS now look at. The answer and it should still be there is high risk premises only, What is high risk about premises like the topic that started this thread?
The fact they had a fire in a commercial premises will initiate a visit by an enforcement officer. A complaint made will also initiate a vist. We also have the watches going out looking at the premises in their area, this creates internal complaints when they find somewhere that is sub-standard. This initiates a vist by an FSO too.
On the subject of "high risk premises only": The way it works is that everywhere we have ever been has been allocated a risk rating. Once we audit somewhere it is also assigned a risk rating. This rating is dependent on many factors (Occupancy, size etc), and (Along with compliance level) will also dictate the time taken before it will be inspected again.
So now if you imagine a list with the premises with the highest rating at the top. we are inspecting the premises at the very top of that list. It won't necessarily mean that a low risk shop will never get inspected, as they will slowly move up the list bit by bit dependent of the inspection interval it is given. So while it may not be all 'high risk' as you might imagine, it is the highest risk that is due for an inspection at that particular time on the list we have. (otherwise we would all be inspecting resi care homes permanently.

If your factory/office/hospital comes to the top of the list you will get your inspection. It might be that the occupancy such as a hospital will always get marked for a yearly inspection to the presence of vulnerable groups etc, but a well managed office might not get inspected for 10 years after the initial audit/inspection.
The regulators compliance code might initiate some changes in this, but at the moment that is how it works here.