The trouble with RA, the RRO and all the rest is that non prescriptive standards lead to just the sort of inconsistent advice/enforcement that you are talking about. Many senior commercial spokespersons are now trying the line that British Standards are too restrictive and being copper bottomed should only be specified in the rarest of occasions. Of course many of their member firms sit on the BS Committees that draft these standards and now that the Government has dismantled the HMI which represented the government view. They may have had their faults but at least they were nominally impartial. I'm getting on my soapbox now, but the Government is slowly abdicating their responsibility to set minimum standards in favour of laissez-faire. Leave it to the Courts to decide whether a standard was acceptable or not. That's if Fire Authorities can afford to keep risking their ratepayers money.
Call it benchmarking, prescription, basic standards, kitemark or what you like...guidance is essential.