OVO Energy is urging customers to follow a four-minute shower rule. OVO Energy has warned UK households to avoid running baths in December - and switch to showers.

The energy giant said: " Hot water costs more than cold water because you need to pay for the energy to heat it up. While we certainly wouldn't want to stop using hot water altogether, we can make some simple changes to use less of it."

Giving its ideas, OVO said: " Consider shorter showers – setting a timer to 4-minutes could save you 30 litres a day. Shower more than bathe – swapping just 1 bath a week for a 4-minute shower could save you £9 a year on your energy bills, and an extra £13 on your water bills.

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" Switch to a water-efficient shower head

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