I've eventually found the post I was looking for...on another forum! Oops! The poster remarked:
I do however still foresee a problem - back in my old patch of central Manchester, we had numerous (sometimes badly) converted mills/warehouses that retained the 240v alarms and they had in many cases old OSRA or Fact Act certificates. We had one that was a problem and served notice to update the alarm. - The owner argued that the FS held the alarm system as ineffective as a mains failure would disable it...... BUT if there was a mains failure, then he said he couldn't work anyway with no lighting and would have to evacuate the premises until power was restored... so no problem, if there was a fire, then no one would be in the building . We lost in court - the judge held that the defence was adequate
This is the problem with laws, rules and recommendations in the U.K. They are made to be ignored and/or overuled! Whilst it is the legal system that might make the ultimate desicion, it seems judges can put any interpretation on anything and however as they see fit.
This is obviously a problem for 'codehuggers' who believe any law, rule or recommendation is written in stone. As soon as they say 'you don't want to do it like that, because I know the law,rules or recommendations and you don't', they set themselves up for a potential fall.
I'm not agreeing (in fact I personally disagree) with the desicion made in the case mentioned, but it just goes to show what can happen.
The best most of us can do is point out the laws,rules and recommendations to our customers and allow them to decide if they want to follow them.
Obviously, enforcement agencies have a different problem, but since it is not their money that they use to try and force their opinion/interpretation they probably don't care that much.