Thanks for all your imputs chaps, they are greatly appreciated. CONQUEROR I refer to page 55 0f the RRO sleeping guide not Building Regulations, easy mistake to make!!! If you examine all the postings on this subject it is clear there is a wealth of experience out there, and a diversity of opinions. If current building regulations are to be applied to existing flats and maisonettes, would it imply that due to recent amendments within the building regulations that they do not conform to the required current standard, and that AFD is required in the communal areas to a GRADE A LD2 standard. Or would a later standard of BR be acceptable not to provide detection in the communal areas. The bottom line is what you find during your assessment, and provide fire safety provisions accordingly!!!. My head is hurting, have a great Bank Holiday..