The main reasons for UWfs ( and why a FRS would issue a notice ) is because the system has not been designed, maintained or is not mananged correctly. With all of these in place UWfs would be at an acceptable level. BS5839 pt 1 and the new HTM ( forgotten the number !) Both give advice and solutions to stop UWfs and they work.
On the subject of enforcement notices, I have seen many 'notices' from all around the country which state ; the following 'requirements' and 'must be completed by the following date' when pushed the officers will state they are 'notices of deficiencies' or ''educate and inform ' letters . It may be because of my age and FP act beginnings but as I understand it, if it states 'requirements' and 'must be completed by the following date' that is an enforcement notice.
I have seen enforcement notices telling a person to carry out a suitable and suffcient FRA and then telling them on the same notice to provide additional passive protection and it is a requirement and must be done, when questioning this with the inspector concerned he insisted it must be done and would not accept that if the 'suitable and suuficient FRA' was carried out it may have the option of suppression and another 25 staff, so the additional passive protection might not be needed, he did not agree, so from that we don't actually need the FRA then do we ? (flippant comment don't reply)
With regards to UWFS policies, the CFOA guidance always stated that life risks such as resi care would have attendances made to them. Now many brigades are sending after 1 false alarm ( not UWFS ) and it may be the first in 3 years, letters to resi care telling them to investigate first before calling the FRS.
So at a time when we are supposed to evacuate a sub compartment in 2.5 mins. (which some FRS are stating on their varied notices) we must at 3. O'clock in the morning when staffing is at minimum, send a 55 years old care assistant into a roof void to see if the remote indicator or panel is telling fibs.
My advice to staff is unless it is 100% obvious that it is n UWfs ( i.e. you saw the detector show after someone propped a kitchen door open and the toaster was on) you should always err on the side of safety and call the FRS, let them make the decision not to attend, and if a disaster happens let them justify it. As I stated at the beginning of my little rant, with correct systems and managemnt there will not be a problem so we should have them, but do not ignore all automatic signals because it suits the chief fire officers statistics.