smoke detectors between floors...

[palmerelectrcal]

i have to provide smoke detectors to the flat above the shop (1) and 3 in the shop itself.
im going to fit a wireless one in the flat.. so am i right in saying only one in the shop needs to be wireless
if i hardwire the other 2? or will i have to fit all four the same..??:dunce2:

 

[Leesparkykent]

http://www.eielectronics.com/images/pdf/Ei168RC_DATA_SHEET.pdf

5th paragraph down under product description.

 

[Octopus]

Are the shop and flat one "unit" or 2 seperate units?

 

[tazz]

Why have you fitted Mains smoke detection in a commercial shop..? Have you or professional conducted a fire risk assessment on the premises, which is Mandatory by law..?
The shop is covered under BS 5839 part 1 the flats are covered under part 6