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Octopus overtakes British Gas as the UK's biggest household energy supplier - Disruptor now has 23.7% of the domestic market, just ahead of its former state owned rival

Britain’s gas reserves have dwindled to a “concerning” low with just a week of supply left as freezing temperatures and low winds grip the country this weekend.

And appliances like showers and washing machines can be big drainers of cash. David Bain, from Castle Water, said: "While this may seem obvious, the savings might surprise you. Cutting your household’s showering time to five minutes can save up to £280 annually.

The free £150 is part of the government’s Warm Home Discount Scheme and is directly applied to household electricity bills by suppliers, including British Gas, Octopus Energy, OVO and E.ON . All households that are eligible should have received a letter by the end of this month confirming that the discount will be applied automatically.

Customers with some of the largest energy firms in the country have been warned in the wake of Christmas and the New Year.

British Gas, Scottish Power and Ovo Energy languish at the bottom of the rankings, based on the experiences of almost 12,000 energy customers and the consumer group’s assessment of 16 firms’ practices and policies.