We're a family of 4 and WFH so home all day, so pretty typical really.
You're not a typical family though, which is the point. The typical "family" is a household of 2.4 people using an average of 242kwh of electric a month and 1000kwh of gas. At current prices that equates to about a payment of £206 a month. A one bedroom house or flat with 1 to 2 people is estimated on average to use 150kwh a month electric and 666kwh on gas, which equates to £141. Even at pre Oct prices its £113 so for you to have a monthly bill of £81 means your usage is abnormally low and not representative of the vast majority of people.