If you have a fire certificate you still need to conduct a fire risk assessment as they relate to two different pieces of legislation.
You are legally obliged to carry out a fire risk assessment and update it on a regular basis. This is irrespective of size of company and the market in which you operate. If you or your company employs five or more people this must be demonstrated by a hard copy present on the premises and available for inspection. A fire risk assessment is not the same as a fire certificate. If you have a fire certificate you still need to carry out a risk assessment. Many insurance companies offer policy discounts to any business that has carried out a fire risk assessment.
Unless you’re an expert it can be surprisingly hard to spot potential fire hazards.