Had A disscussion with Gas Safe a few years ago, domestic cooker into a kitchen in a small deli,only wanted to warm scones & soup.
My concern was there were flats above, so therefore was concerned about the cooker not having full safety cut offs.
I was told that I shouldn't even been considering the job as it was commercial, commercial premises !
I explained that I always had understood that it had always depended on meter,pipe size & appliance. No commercial premises, commercial ticket....What do I know, only 30+ years in the industry, with BG & self employed working only on gas.