Be cautious of unexpected payment demands, pressure to pay immediately, requests for bank details by text or email, and callers who refuse to provide a verifiable company name. Check bills for estimated readings, unexplained charges, sudden tariff changes and unusually high usage; compare them with your meter and previous statements. Contact your supplier using the phone number on its official website or your bill, rather than a link in a message. For switching, check the tariff’s standing charge, unit rates, exit fees and terms through an FCA-authorised or trusted comparison service.