Martin Lewis said the "zombie Government" must not wait until the conclusion of the Tory leadership contest to decide on help for households who will face the energy price cap rising to £3,500 or more.
The Money Saving Expert dismissed the extra help promised by Mr Sunak and Ms Truss during their leadership bids as "trivial" in the face of bills which are set to be £2,300 a year higher than they were last October.
He said: "I've never seen anything like this. It's going to throw many households into a terribly difficult financial situation that will leave them making some awful choices."
