https://www.citizensadvice.org.uk/wales/consumer/energy/energy-supply/problems-with-your-energy-supply/check-whos-taken-over-your-energy-supply/
Check who's taken over your energy supply - Citizens Advice
If your energy supplier has gone bust, check which company has taken over your energy supply.
your energy supplychecktakencitizensadvice
https://www.citizensadvice.org.uk/cymraeg/Defnyddwyr/energy/energy-supply/your-small-businesss-energy-supply/dealing-with-your-energy-supply-when-you-move-business-premises/
Dealing with your energy supply when you move business premises - Cyngor ar Bopeth
Steps to take when moving in or out of business premises. Proof of change of tenancy documents required.
your energy supply
https://www.citizensadvice.org.uk/scotland/consumer/template-letters/letters/energy-letters/letter-to-complain-to-energy-supplier-about-transfer-without-consent/
Letter to complain about your energy supply being switched without your agreement - Citizens Advice
Use this template letter to complain if you were switched to a new energy supplier without agreeing - fill it in, download and sent it
your energy supply
https://www.citizensadvice.org.uk/consumer/energy/energy-supply/
Your energy supply - Citizens Advice
Get advice if you're having problems with your gas or electricity supply.
your energy supplycitizensadvice