Be wary of callers or salespeople who pressure you to decide immediately, promise unusually large savings, or ask for your bank details before you have checked who they represent. Read the full tariff information, including the unit rates, standing charge, contract length, exit fees and whether the deal is fixed or variable, rather than relying on a headline monthly estimate. Treat requests for upfront fees or payment by unusual methods as possible scam warnings, and verify the supplier through its official website. Compare deals using a trusted service and check Ofgem or Citizens Advice guidance if you are unsure.