I'm all electric and its a 1 bed apartment in a 1960's building, 3rd floor of 13. My average yearly bill is £600 which is pretty ridiculous considering I'm not there 8-7 Monday to Friday or all weekend
If I used the electric heating as others use their gas central heating (continuous from 7pm-11pm) weeknights, my bills would easily hit £100 per month in winter. As it is I visit friends a lot and freeze my bits off most of the time!