The visit is domestic advice done properly, not an inspection with consequences: nothing is enforced and nothing is certificated, because the point is prevention. Individual private dwellings sit outside the Fire Safety Order, so there is no statutory assessment to carry out inside your own flat or house; the visit fills that space with practical help, is booked directly with your local fire and rescue service, and is genuinely free, with no sales agenda attached.
The boundary is the flat front door. Inside the dwelling, fire safety is advice territory; beyond it, shared staircases, corridors and plant rooms are common parts and need a real assessment under the Order, a line that do I need a fire risk assessment if there are no common parts approaches from the other direction. A block cannot rely on residents having had home visits; the common parts duty exists regardless of what happens inside each flat.