Can you use Automist to compensate for an Inner Room?

Approved Document B gives the general advice that fire suppression systems may allow inner rooms, but does not give specifics, except in the case of loft converted houses with a total of three floors after the conversion (an additional basement floor may also be permissible). In the case of flats with rooms above the first floor, the clearest guidance available is the recent BS 9991, which proposes fire suppression throughout the flat, although this is at variance with a common practice of providing suppression in the access room. Many Building Control bodies have their own policy on the matter.