In the pamphlet, Brown said that there is a “black hole in provision” for energy costs and highlighted the “huge amount of inequality between the positions of those privileged people and the people who are suffering”.

He went on to urge prime minister Rishi Sunak and chancellor of the exchequer Jeremy Hunt to fund further support by cracking down on bankers’ bonuses and people with non-dom tax status.

“People are worse off and 2023 is going to be worse than 2022,” he told the paper. “People are going through these winter months, I’m afraid, knowing that things are going to get worse after April. You’ve got to provide a level of help with heating that is higher than it is at the moment.

“Why didn’t the government do anything about non-domiciles? Why didn’t they do anything about bankers’ bonuses? Why didn’t they do anything about the City generally?”

Under the government’s current plans for energy support, households have received a £400 payment to help with energy bills from October 2022 to March 2023, while the energy price guarantee has capped the price of electricity and gas at a lower rate than Ofgem’s projected energy price cap.

Millions of British households will soon spend one-third of their income on fuel costs