What I am saying is that they complied with older legislation, but progressively became unacceptable in altered premises from the 90's onwards - existing usage remained in many premises because of the statutory bar imposed by fire certificates (if a key box was accepted as OK in 1979 on a fire cert & the premises were still not materially changed in 1992, the key box would remain & the fire authority couldn't enforce it's change).
They would not be deemed to comply with current legislation and benchmark guidance precludes them, but their sale is legal as they have numerous other uses.
In both Summerland & Woolworths fatalities were found grouped against storey exits onto escape stairs with the key in box method of escape - the inquiries suggest that panic bolts would have ensured their escape