Consumer champion Martin Lewis has warned Brits cannot wait for help with crippling energy bill rises in a desperate plea to politicians.
The MoneySavingExpert founder urged Boris Johnson and the leadership candidates to "sit in a bloody room" and hammer out a plan ahead of the autumn - and warned waiting for a new Prime Minister would be "absolutely too late".
He denounced plans by Tory leadership contenders to suspend green levies and axe VAT on energy bills as "trivial".
The cap on household bills is predicted to rocket to £3,420-a-year in October and £3,850 in the first quarter of 2023, according to BFY Group.
Average monthly bills could soar to the equivalent of £500 per month in January.
It comes as Energy giants British Gas and Shell both announced profits worth billions of pounds as the UK faces crippling energy hikes.
Mr Lewis said the average house would be paying £2,300-a-year more on energy bills in October compared to the previous year, against a backdrop of rising costs and tax hikes.
"The package that has been put out so far to help the poorest homes, who have the least financial resilience, is a maximum £1,200," he told BBC Radio 4's Today programme.
"That is not sustainable for the poorest homes."
He said the "zombie Government" was not able to make big decisions - as Tories tear strips off each other in the leadership contest - and people will be "panicking".
"By September 5, when we have a new Prime Minister, we will absolutely be in the mire of this," he said.
Directly appealing to the PM, Rishi Sunak and Liz Truss, he said: "We cannot wait ... there needs to be action now.
"You're all in the same party, you should be able to work out some unifying policy, something for heaven's sake, so sit in a bloody room, decide what you are going to do together.
"Take a little bit of collective action and give the panicking people of this country a little bit of respite from this."
Mr Lewis said waiting for a new PM will be "absolutely too late" and urged the Government to ask Ofgem for guidance.
He tore into the policies announced by the leadership contenders, saying: "I'm afraid green levies and cutting VAT, they are trivial in the big picture of this."
