If you agree that the person in the flat over the kebab shop is a relevant person then you must agree that everybody in purpose built private flats with a common escape route is also relevant. Do you then have to gain access to every flat in order to carry out the RA.
I agree but we're going off the scenario posed by the original poster. I wont take that particular poser any further for now in case my brain explodes or is springboarded into oblivion.
Where you have mixed use buildings such as flats above commercial premises the commercial premises must ( and there are no ifs, no buts, or no maybes with this ) take into consideration those relevant persons living above
As you say Nearlythere if no one is living in the flat there is no problem but if someone does move in its "review your risk assessment time"
There has got to be provisions put in place to protect the residents.
Even if you put in 60 minutes separation with no AFD and treat it as a seperate occupany it still has to be identified / addressed in Mr "No residents live here honest Guv" Kebab's fire risk assessment.
How could you not do an assessment on it?