To convert that to kWh, assuming a 10-15c/kWh rate, that would equate to 40,000-60,000 kWh per year in the SW and 6,400-9,600 kWh in the NE.
My figure for a 4 bed house in the UK is about 4,800 kWh per year.
My figure for a 4 bed house in the UK is about 4,800 kWh per year.
So it's worth keeping in mind that the actual power usage figure may be a fair amount lower, and that your SW calcs are a bit of a worst case estimate.