In the UK, how to understand the relationship and the differences between fire risk assessment and occupational health and safety risk assessment?

Under the Health and Safety at Work etc. Act 1974 the employer is required to produce a written statement of his general policy with respect to the health and safety at work of his employees, which in my interpretation is the occupational health and safety risk assessment. Under The Regulatory Reform (Fire Safety) Order 2005 the employer is required to conduct a fire risk assessment which can be included in the occupational health and safety risk assessment or separate if he/she chooses. Each piece of legislation requires different duties, the employer has to conform to and deal with different health and safety issues.

Thanks a lot.