Average use for a 4 bed detached house is ~4000KWh pa for electricity + gas for space heating and hot water ~12000KWh pa.
Bear in mind that if heating by electric you would likely need ~4000KWh as you would almost certainly install some sort of heat pump (air or ground source) with a coefficient of performance of 3-4.
Even with a larger (say) 5 bed detached I would not expect electric (assuming gas CH) to exceed 6000KWh pa - an average of ~500KWh per month = to a standing order of ~£160 a month.
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