MP John Funicane said appeals from the Prime Minister to energy companies are "worthless".
He said: "These big energy corporations are walking away with eye-watering profits on the back of hiking the bills of ordinary workers and families, forcing many to choose between heating and eating.
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"Rather than get tough on these companies, the action taken by the British government to cut fuel bills has been abysmal and has made no impact.
"Words aren't enough, it’s time for the British government to act by cutting taxes on fuel and ensuring energy companies pay their fair share to bring down people's bills.
"And they should stop giving cover to the DUP to block an Executive being formed in the north, an Executive that could be working today to put money in people’s pockets to deal with the rising cost of living."
