Fire alarm system

[Spaxgt]

We have a chips shop with a 2 bedroom apartment on top, the apartment has its own side entrance through the alley way which also has a separate back door for the chip shop

 

do I need a fire alarm system which inter connects to the apartment above using a repeater panel so many panel in the shop and repeater panel in the apartment 

 

zones

loft unused - zone 1

Apartment - zone 2

chip shop - zone 3

basement unused - zone 4

 

or can I install domestic smoke alarm and heat alarm in the apartment and a Ctec fire alarm system in the chip shop 

[AnthonyB]

Your fire risk assessment, a legal requirement in ALL premises should address this. It all depends on the fire separation between the chip shop & apartment - if it can be proven to be 60 minutes fire resistance then you won't need the building wide fire alarm system, just the Part 6 Grade D smoke/heat alarms to the flat and (if required, it may not need it in this case)a separate Part 1 system just to the Chip Shop