Sorry for not replying sooner, been busy, then couldn't logon until Kurnal fixed it for me. Thanks for the comments.
Latest update after a site visit. Originally staff were employed to oversee the complex, check out alarms and call the FS or reset the fire alarm anel. For a few years now due to cutbacks, no staff on duty except the working day. Then it transpires that some of the tenants have keys for the fire alarm panels, go down silence it and go back to bed. There are four panels, one for each block, contained in a locked store to prevent vandalism.
As stated in earlier replies, there is good compartmentation so no need for the shop alarms to sound throughout the premises. I feel it would be built a lot differently today. Unfortunately it has become custom and practice for the tenants to silence the alarms themselves without checking or calling the FS.
The fire alarm engineer supposes if the tenants cannot silence the alarm then it will probably be pulled off the wall in bits. Each flat have their own self contained fire alarm.
Just to make things worse the complex is locked at night to deter intruders. two access gates have EOD's on the inside to allow tenants out, but if a tenant calls a doctor or ambulance they have no access into the complex unless the tenant opens the gate. The FS can cut the lock for entry. After much debate one gate is left permanently unlocked. Which would be worse, some vandalism, or a doctor unable to reach a heart attack victim?
DavyFire