Risk assessment is dependent on the interaction between physical fire precautions, the dependency of the occupant, fire hazards and the availability of sufficient and appropriately trained staff.
The Responsible Person for any Premise is legally responsible for the completion of a Fire Risk Assessment for his/her premises. The Fire Safety Order allows for any competent person, appointed by the Responsible Person, to carry out an assessment.
Risk assessment will inspect and review the interaction between physical fire precautions, the dependency of the occupant, fire hazards and the availability of sufficient and appropriately trained staff. A fire risk assessment helps you identify all the fire hazards and risks in your premises. You can then decide whether any risks identified are acceptable or whether you need to do something to reduce or control them. The process gets complex when additional hazards and risks are present due to the type of building and occupancy type.
Two examples of this would be residential care homes and hospitals, hospitals have all manner of complex systems which will need to be considered when undertaking the fire risk assessment, one such consideration is the evacuation strategy which is likely to be Progressive Horizontal Evacuation. The building may also contain piped gases, mechanical ventilation, external cladding systems, storage of dangerous substances and other hazards which have the potential to increase the level of risk to the occupants and the building itself.
https://www.gov.uk/workplace-fire-safety-your-responsibilities/fire-risk-assessments