Find out who your gas or electricity supplier is - Citizens Advice
https://www.citizensadvice.org.uk/consumer/energy/energy-supply/moving-home-your-energy-supply/find-out-who-your-gas-or-electricity-supplier-is/
WebWhen you know who your network operator is, visit their website to search for your electricity supplier. You can usually search using your property’s postcode, but some network operators might ask you to fill in a form. If your network operator is: National Grid - check your supplier on the National Grid website.
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