BS 8674 exists because competence claims were previously hard to test: anyone could trade as a fire risk assessor, and responsible persons had little beyond reputation to go on. The standard sets out what a competent person doing fire risk assessment needs to know and be able to do, so that training providers, third-party schemes such as BAFE SP205, the IFE registers and FRACS, and individual assessors all work to one shared definition instead of private ones.
For commissioning, BS 8674 changes the questions you ask. Instead of requesting a CV, you ask how competence is evidenced against the standard and whether third-party certification backs the claim. That diligence carries more weight than it used to: responsible persons now record who carried out each assessment, and appointing someone genuinely competent has itself become part of complying. How to obtain a fire risk assessment folds these checks into the commissioning sequence.