I'm with EIBCO and my annual gas bill is around =A3300. We have gas heating for our three bedroom house, but cook with elec.
Thermostat is set to about 19, but SWMBO turns it up to 22 or even 23 when I'm out!! I come back from work and it's like a fecking sauna, but will she wear a sweater? I am often to be seen in a t-shirt in the house in the depths of winter!
We only use the downstairs rads, apart from a small one on the landing that is apparently required to be on the way the system is set up.