As a landlord you should be aware that you are responsible for the safety of your tenants. Your legal duties apply to a wide range of accommodation occupied under a lease or licence.
Every gas appliance in a rented accommodation must be tested annually for safety and certified. Landlords should ensure gas appliances, fittings and chimney/flues for tenants are safe. Certificate is meant to be displayed for the tenants to see.
James Winney will perform a gas test for as cheap as £55 + VAT for cooker and boiler.