UK inflation will quadruple to about 4% in the second half of next year and cut disposable income, a leading think tank has forecast.

The rise in prices will “accelerate rapidly” during 2017 as the fall in sterling is passed on to consumers, according to the National Institute for Economic and Social Research (NIESR).

The revised figure is sharply higher than the 3% it forecast in August.

The economy also faces “significant risks” that could restrict growth.

“Households have really got a choice. Do they spend less or do they start saving less?” Dr Angus Armstrong, director of macroeconomics at NIESR, told the BBC’s Today programme.

He said given the savings ratio was at its lowest level since 2008, “the most likely scenario is that they spend much less, hence the weaker [growth] forecast for next year.”

Consumer Price Index (CPI) inflation rose to 1% in September, up from 0.6% in August, the Office for National Statistics (ONS) said last month.

That was the highest rate for nearly two years as the cost of clothes, petrol and hotel rooms increased.

The Bank of England is expected to raise its forecasts for inflation in its quarterly Inflation Report on Thursday.

The pound has fallen sharply against the dollar and euro since the Brexit vote and NIESR expected sterling to remain at about $1.22 and €1.11 both this year and next.

‘Hefty price rises’

Simon Kirby, head of macroeconomic modelling and forecasting at NIESR, said the fall in sterling had been the most striking feature of the economic landscape since the EU referendum.

“This will pass through into consumer prices over the coming months and quarters,” he said. “While we expect this to be only a temporary phenomenon, it will nonetheless weigh on the purchasing power of consumers over the next couple of years.”

The last time CPI inflation hit 4% was in 2011, before falling back over the last five years.