As a homeowner how can I get an annual gas certification done?

As a homeowner how can I get an annual gas certification done?

I think you have to have it done locally by a registered gas whatever you call them these days used to be Corgi.

As a homeowner how can I get an annual gas certification done?

If you are a homeowner and the property is not let or rented out then you don’t need a gas certificate. I’m assuming you are referring to an annual safety check to make sure your appliance is safe to use, if so this MUST be done by a Gas Safe registered person. Please see https://www.gassaferegister.co.uk/find-an-engineer/ if you wish to find a registered person.