All businesses must comply with Health and Safety Law. Staff must be trained and any organisation that is responsible for the health and safety of employees must have a health and safety policy in place. A health and safety policy sets out your general approach and commitment together with the arrangements you have put in place for managing health and safety in your business. A documented health and safety policy is a legal requirement if you employ five or more people. If you have fewer than five employees you do not have to write anything down, though it is considered useful to do so if, for example, something changes.