a flat in a block flats is a single
domestic premises is it?
Still a bit puzzled with where you are coming from on this one clevelandfire, would you by any chance be getting mixed up with HMO's at all?
as far as I can see from what PhilB has already said: Quote,
domestic premises" means premises occupied as a private dwelling (including any garden, yard, garage, outhouse, or other appurtenance of such premises which is not used in common by the occupants of more than one such dwelling);
it is the words in brackets that are the important bits, by excluding from the definition , common parts of blocks of flats, and similar premises , such as HMO's, such common parts fall within the scope of the FSO.
And Article 31(10) of the FSO, allows for a prohibition order to be served on an HMO, and this power is not limited purely to the common parts.