Pasta among supermarket staples that have risen by 8% in Britain's main grocery stores

Changes in the average cost of the food items were tracked by retail research firm Assosia. Credit: PA Wire/PA Images

Supermarket staples like pasta, tinned tomatoes and strawberry jam shot up by around 8% in just one year, analysis has suggested.

According to new figures, the overall price of a basket of 15 standard food items rose by £1.32.

The public is already facing surging energy prices and increased national insurance contributions in April.

The data analysed by the BBC came from the retail research firm Assosia, which tracked the average cost of grocery items at Asda, Morrisons, Sainsbury’s and Tesco.

The company recorded more than 17,000 price increases across the main supermarkets in January, more than double the number in the same month last year, and across every category.

Not all products have seen an increase though, with carrots and mild cheddar among the items that have fallen slightly in price.

The price of a basket filled with 15 standard food items rose by £1.32 Credit: Aaron Chown/PA

Assosia director Kay Staniland said the findings were a result of selecting popular products that were comparable across the ranges of value and standard.

She added in comments to the BBC: “Looking at food prices is a bit of a minefield.

“I think the figures show that retailers are trying to avoid the biggest increases to value lines as much as possible. But these value lines do make up a small part of total ranges. The standard mid-tier range is where the largest volume of sales come from.”

It comes after figures released last month from the British Retail Consortium (BRC) found shoppers are facing the highest price rises for almost ten years.

Food inflation rose from 2.4% in December to 2.7% in January, with price rises reaching the highest rate since October 2013, according to BRC.

Tesco Chairman John Allan said last week that although food prices at the supermarket chain grew by only 1% in the last quarter, they could go up by 5% in the coming months.