There is a summary of FP Note 1/70 in the 1977 edition of Book 8 of the Manual of Firemanship. Except for single dwellings, blocks of flats or maisonettes, there is no difference in access requirements for different occupancies; the requirements are decided entirely on the volume of the building and its height.
Not greater than 7000cubic metres:
<6m height - pumping appliance to be not more than 46m away from any point within the area of the ground floor
6-9m height - pumping appliance not more than 30m away ........
>9m height - HP/TL to be able to reach at least one-sixth of the total length of the perimeter walls along at least one side or more.
7000-28,400 cm:
<9m height: roads along one or more sides, at least for one-sixth of the total length of the perimeter wall for pumping appliances.
>9m height: roads along two perimeter walls for TL/HP
28,400-56,800 cm:
<9m: Along two perimeter walls for pumps
>9m: Along two perimeter walls for all appliances
56,800-85,200 cm: Along three perimeter walls for pumps (<9m height) or all appliances if >9m height
>85,200cm: access all round
Hope this helps.
