First there is no conflict part of the original idea of the FSO was that people would be able to carry out their own FRA on their premises. Following this there has been long discussion about the competence of people and third party accreditation, see elsewhere on this forum.
Following this, what exactly is your position. Is the building occupied by the landlord or is it leased out to another company? From this you will be able to determine who the Responsible Person is and it is their role to take suitable action.
The key is determining who is the RP. The other thing to bear in mind is that under the order all RPs have a duty to assess the risk in event of a fire, the main difference is that if more than 5 people are employed the significant findings have to be recorded.