Business health and safety responsibilities
If you are working alone, your duty is to ensure you do not expose customers or members of the public to hazards you may be creating.
If you are an employer, you should have a health and safety policy and you must undertake a risk assessment. Both must be available to your employees so that they are aware of any rules or procedures they must abide by. If you have more than 5 employees, the policy and risk assessment must be written down.
It is good practice whether or not the policies are written, to keep a record of all staff to whom you have communicated the health and safety message.
The Health and Safety Executive website has some useful tools to ensure that you are doing what is necessary to comply with health and safety legislation.