"The building planning permission drawings done by an achitect shows smoke detectors in all room flats, kitchens and down stairs main entrance hallway and 2 up floor landing."
I don't know why architects place detectors and bells on drawings.
The electrician (if he was compitant) should have designed, installed and commisioned the system, and produced the relevant certificates to back him up. The system should comform to BS 5839 Part6 2004, the exact catigory should have been specified by the Architect/purchaser at the planning stage.
You should never put smoke detectors in kitchens, and it's better to have heat detectors in the hallways outside kitchens if the tennants insist on carrying out late night half pi**ed fryups with the door wedged open.
Either way, it is the designer's responsibility for minimising the risk of false alarms.
Ideally, you would have a seperate zone for each flat, but if you had 2 flats on the same level for instance, they could share a zone and be within the BS
The FAP should really be within view as you come through the entrance to the building.
(hope I know what i'm talking about)