Parliament will only sit for a handful of days over the course of three months during the biggest cost-of-living crisis in decades.
Liz Truss and her Chancellor Kwasi Kwarteng will hold a mini-Budget next week, most likely on Thursday.
It will confirm some of the tax cuts - including corporation tax and National Insurance - that the new PM promised in her leadership campaign.
Crucially, it will also give the first details of how an energy bills bailout will be funded - with Ms Truss planning to slap the cost on the national debt.
But Parliament is due to break up again next Thursday night for a three-week party conference recess, which it’s understood No10 has no plans to cancel.
Since July 22, Parliament has only sat for four days - excluding two extra days devoted to tributes to the Queen.
That means between July 22 and October 17, when Parliament returns, it will only have sat for between five and seven ‘normal’ days in total.
It is not known how many days MPs will sit for next week - but there is speculation they could sit only for just day for the “fiscal event” on Thursday.
On the other hand, No10 has not ruled out delaying the recess by a day, and having the mini-Budget next Friday.
The government is also looking at cutting short the end of MPs' conference recess - due to run until October 17. The PM's spokesman said: “That’s something that would need House agreement and we will want to consider that.”
Meanwhile, the date of the emergency budget will only be announced next week after the Queen's funeral.
Downing Street is now claiming Liz Truss’s scheme to cap average energy bills at £2,500 a year - which is still lacking key details, including the exact support for businesses - can be passed without emergency laws.
And the Prime Minister is expected to visit the UN General Assembly in New York after the Queen’s funeral, leaving her absent at PMQs next Wednesday.
Campaigner Gina Miller tweeted: “With the crisis facing people, Conference Recess from 22 Sept for 3 weeks after a long Summer Recess and in effect no government is shameful.
“The energy package needs details and legislation. A one day recall isn't enough. Conference should be cancelled.”
Former government advisor Sam Freedman added: “During the 86 days between 22nd July and 16th October Parliament will have been sitting for normal business for five of them. Not ideal in the circumstances.”
Senior Tory John Redwood had called for Parliament to meet after the state funeral next Monday. He said: “We need to tackle the cost of living crisis and energy shortage.”
Fresh inflation figures are out at 7am tomorrow with CPI already at 10.1% - pushing the costs of food, clothes, fuel and bills to record highs.
Meanwhile the mood in the Treasury is said to be “grim” after new Chancellor Kwasi Kwarteng tightened his grip on officials’ thinking.
He sacked experienced permanent secretary Tom Scholar, and told staff on a conference call to focus on boosting growth to 2.5% a year - its average before the 2008 crash.
Ms Truss attacked Treasury “orthodoxy” in her leadership bid.
The House of Commons is suspended during a national mourning period, while the estate’s Westminster Hall is prepared for the late monarch to lie in state.
Details of the Queen’s ill health emerged midway through the debate on the energy bills plan last Thursday, when a note was passed around the shocked-looking Labour frontbench.
Ms Truss had announced last week long-awaited plans to tackle energy bills and ease the cost-of-living crisis, with a focus on capping prices and boosting domestic energy supplies.
That includes lifting the ban on fracking and new licences for North Sea oil and gas, as well as stating support for clean energy sources including nuclear, wind and solar.
Under the Government's "energy price guarantee", bills for the average household will go no higher than £2,500 at any point over the next two years.
It will save a typical home around £1,000 from October 1, when the current consumer price cap had been set to soar, according to official estimates.
Passing legislation is not believed to be required to bring the price guarantee into effect for households, although businesses are still facing a wait for details about additional support.
"There isn't a date set for the business support element of the guarantee. Obviously we're working that through. It hasn't been impacted by the mourning period, as I understand," the Prime Minister's spokesman said.
Chancellor Kwasi Kwarteng is due to give specifics of how the plan will be funded during the emergency fiscal announcement.
The Liberal Democrats have cancelled their party conference, which would have clashed with the Queen's funeral.
Labour and the Conservatives are expected to still hold their conferences, even if the annual events are likely to be more low key this year.
Lord Archer, former deputy chairman of the Conservative Party, said the Government will be working on the cost-of-living crisis "behind closed doors".
He told Sky News: "They will be discussing it daily. They'll be working at it daily, but you won't get official announcements.
"It is, as you rightly say, remarkably strange that we had a new monarch and a new Prime Minister within a week. I mean, a novelist couldn't write it.”
