BSD opinion on an unenclosed stair wholly contained within a bedroom in a three-storey dwelling under a SCOTTISH TYPE APPROVAL submission

The Opinion of the Building Standards Division Within the Roxburgh house type the following measures have been proposed to compensate for the variations from the guidance: 
the 2nd storey bedroom (and access stair) is fire separated from the remainder of the dwelling on the 1st storey by walls having short fire resistance duration together with a self-closing fire door 
additional smoke detection is to be provided to the top and bottom of the landing of the stair providing access to the 2nd storey bedroom 
an escape window is to be provided at the bottom landing of the stair serving the 2nd storey. 
 
In this proposal, the provision of a single upper bedroom is not viewed to increase the level of risk from fire and smoke to the occupants of the dwelling. The limited travel distance and increased awareness provided by the fire detection and warning system should reduce the time until a fire will be detected and improve the time to escape reducing the level of risk to the occupants.