You will need to have a gas safety check if you are a landlord renting a property or even letting a room to show that the property is safe to live in and the appliances are safe to use.
This is a legal requirement for all landlords but is also highly recommended on any kind of property.
A faulty gas appliance could be liable to omit carbon monoxide which is often undetectable by smell, site or taste and can be fatal.
The gas engineer will provide a certificate (CP12) upon completion of the work.