This is not required by law but it is worthwhile if members of the public come into contact with a contractor at the client’s site. The contractor (who is seen as the umbrella company employee) is likely to be required to be covered by Public Liability insurance as part of the contract, but will not be covered by the clients own Public Liability insurance.
Most umbrella companies offer Public Liability insurance because a lot of contractors will deal with the public in some way and could be out visiting clients offices on contracts. This is an important point to consider as it is commonly assumed that Public Liability is only needed if you have visitors to your own business premises. In fact, you could still be liable if you damage your client’s property when you visit their offices.
Public Liability insurance covers you in case something you do cause a member of the public or one of your colleagues’ injury, or another sort of loss. Additionally, you are covered if something you do causes damage to their property.