I should add that by way of reference I dont do fore alarms per se for a living. I do commercial and procurement consultancy. I work with people like CBRE, JLL, Balfour Beatty, G4S and their clientele under their FM and Corporate real estate side to fix supplier related problems.
Im currently working on prisons, schools, and hospitals for a client and they all have very complicated and critical hire end fire and security systems. Some are from Tyco ADT (prisons in particular), all be a lot of the prisons now use a fireworks demist system thats been MOJ specified
The sprinkler guys at the NWHl are the old Wormauld Ansell business sim sure (now owned by Tyco). They see to work for me when I worked for Tesco across the DC's and we only ever had one issue which strangely enough was sprinkler head replacements. But their software and panels were regularly upgraded and maintained