Yeah studio flat fail here too. Not sure how gas compares but I did it once with the electric heating option (coz I have a storage heater) and once with the no heating option (coz I've never turned it on in the two or three years I've lived here) and it made fuck all differenceFirst question fail, my flat is the world's smallest studio flat.
Also there's no option for I'm a tight arse who won't put the heat on (we added like 15 to the gas numbers over last 18 months)