A Downing Street spokesperson said any extra measures would be for the next Prime Minister to decide upon.

The decision is a rejection of a call by former prime minister Gordon Brown for Mr Johnson to summon a meeting of the Government’s Cobra civil contingencies committee to address the cost-of-living crisis.

The Prime Minister’s official spokesman said Mr Johnson – who is back in No 10 following his holiday in Slovenia – would be speaking to Chancellor Nadhim Zahawi to ensure that support measures due to come into effect later in the year remained on track.

Boris Johnson will leave decisions on further cost-of-living support to his successor.

However, the spokesman said that any further measures would be a matter for the next prime minister.

“Clearly these global pressures meaning challenging times for the public. The Government recognised that the end of the year will present wider challenges with things like changes to the (energy) price cap,” the spokesman said.

“That is why, at the start of the summer, we introduced a number of measures to help the public. Clearly some of the global pressures have increased since that was announced.

“By convention it is not for this Prime Minister to make major fiscal interventions during this period. It will be for a future prime minister.”

Writing for the Daily Record newspaper on Monday, Mr Brown issued a plea for “urgent measures” to cover further rises in fuel bills amid “millions standing on the edge of a financial precipice”.

He urged Boris Johnson to unite with Tory leadership hopefuls Liz Truss and Rishi Sunak to prepare and agree on an emergency budget – or face growing pressure to recall Parliament and force them to do so.

Mr Brown said: “With millions standing on the edge of a financial precipice, we call for urgent measures to cover the cost of a further £1000-plus rise in fuel bills on top of April’s already painful increases.

“The facts right now are grim: four in every five pensioners, four in every five single parents and four in every five large families face fuel poverty – that’s when their energy bills come to more than 10 per cent of their weekly incomes.

“About 35 million people in 13.5 million households are under threat of fuel poverty in October – that’s an unprecedented 49.6% of the UK.”

He warned that if no action is taken ahead of a further price rise in January, the number of fuel poor in the UK could reach 39 million people in 15 million households.

Mr Brown said this morning that there is a “vacuum” at the centre of Government which has stopped it tackling the cost-of-living crisis.

The former prime minister said on Good Morning Britain: “There’s got to be someone in charge. And it’s not just that they’re asleep at the wheel – there’s nobody at the wheel at the moment.

“You’ve got Boris and his chancellor who have been on holiday, and then you’ve got the two leadership candidates on the campaign trail.

“What’s happening at the centre of Government is there is a vacuum and it’s got to be filled immediately if we’re going to protect people by October.

“I know from my own experience, you’ve got to act quickly to deal with the benefits and tax issues if you’re going to get the changes in by the time you want them to be in.”

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Boris Johnson rejects Gordon Brown's plea to agree emergency cost-of-living help