Consumer price inflation hit nine per cent in April, the Office for National Statistics said on Wednesday, surpassing the peaks of the early 1990s recession that many Britons remember for sky-high interest rates and widespread mortgage defaults.

Reuters' poll of economists had pointed to a reading of 9.1 per cent.

Britain now has the highest inflation rate of Europe's five biggest economies and almost certainly the Group of Seven countries, with Canada and Japan yet to report figures for April. Neither are likely to match Britain's price growth.

"We cannot protect people completely from these global challenges but are providing significant support where we can, and stand ready to take further action," Sunak said.

Sterling fell after the data and was down 0.6 per cent against the dollar at 0816 GMT.

Soaring energy bills were the biggest inflation driver, reflecting last month's increase in regulated energy tariffs. Knock-on effects from Russia's invasion of Ukraine means those bills are likely to jump higher again in October.

Households are facing the biggest cost-of-living squeeze since records began in the 1950s, according to Britain's budget forecasters, and consumer confidence has sunk towards all-time lows.

Anti-poverty campaigners called on Sunak to act now, starting with an immediate increase in the value of welfare benefits to match inflation.

A survey published on Tuesday showed two in three people in Britain had kept their heating off when they would normally have turned it on, almost half were driving less or changing supermarkets and just over a quarter say they have skipped meals.

Food prices rose by nearly seven per cent in the 12 months to April, the ONS said.

On Monday, Bank of England Governor Andrew Bailey, speaking to lawmakers, said food price rises were a major worry as he apologised for "being apocalyptic for a moment."

While the government has said it now has a 22 billion-pound ($A39 billion) package of support for households, much of this is cancelled out by the effect of recent tax increases on workers.

An increase in prices charged by restaurants and cafes, as value-added tax rates went back to their pre-pandemic levels in April, also added to the inflation jump last month.

The BoE this month forecast inflation would top 10 per cent later this year and investors expect it will add to the four interest rate increases it has implemented since December and which have taken its Bank Rate to one per cent, its highest since 2009.

There were signs of further inflation pressure ahead as manufacturers suffered the joint biggest increase on record in the prices they pay for their raw materials, which were up by an annual 18.6 per cent, matching March's high.

Factories increased their prices by 14.0 per cent over the 12 months to April, the biggest jump since July 2008.

Australian Associated Press