I was surprised to see how low electricity usage is.
The fairer measurement is probably gas and electric, and your source says ‘ According to Ofgem, the average British household has 2.4 people living in it and uses 2,700 kWh of electricity and 11,500 kWh of gas. This works out at 242 kWh of electricity and 1,000 kWh of gas per month.’
We don’t have gas at home and use about 10,000kW/h here in New Zealand.
Type | yearly usage | average annual cost
Low (flat or 1-bedroom house / 1-2 people) | 1,800 kWh | £669.95
Medium (3-bedroom house / 2-3 people) | 2,900 kWh | £943.36
High (5-bedroom house / 4-5 people) | 4,300 kWh | £1,291.34
source: https://www.britishgas.co.uk/energy/guides/average-bill.html