In short, all landlords are governed by the Landlord and Tenant Act 1985 in which it states that landlords are under the obligation of making their properties safe.
Therefore, it is implied that you are required to assess if the property is at risk of fire or not, and what remedial work needs to be carried out.
The worst case scenario, in which a fire has been caused in the property which has resulted in injury or worse, death, then an investigation would identify if the landlord had conducted an assessment of the building for fire risks and whether the landlord could be indirectly at fault.
Secondly, most insurance companies will want to see that fire risk has been mitigated and may request a copy of the fire risk assessment
Thirdly, licenced HMOs with Liverpool Council are required to have a fire risk assessment.