The terms of immoderate of the astir fashionable branded nutrient items person arsenic overmuch arsenic doubled successful 2 years, caller probe suggests.
Heinz Tomato Ketchup saw the biggest mean percent increase, with its 460g top-down mentation up by 53% oregon 91p, according to Which?
It besides recovered that Dolmio Lasagne Sauce (470g) saw the second-biggest jump, up 61p successful 2 years.
Its survey compared prices of 79 items crossed six large supermarkets.
The user group's findings suggest that the terms of immoderate of Britain's favourite branded products mightiness beryllium rising much rapidly than the wide outgo of living, which is going up astatine its fastest complaint successful 40 years.
Which? analysed the outgo of branded nutrient items disposable successful Asda, Morrisons, Ocado, Sainsbury's, Tesco and Waitrose implicit a 30-day play from 21 September to 20 October successful some 2020 and 2022.
It recovered that the terms of a 400g tin of Classic Cream of Chicken Soup by Heinz besides went up an mean of 46% oregon 44p crossed the committee from astir £1 to astir £1.50.
Batchelors Super Noodles BBQ Beef Flavour (90g) went up from an mean of 59p to 82p, crossed the six supermarkets.
Discount retailers Aldi and Lidl were not included successful the survey arsenic they did not person capable comparable items.
One of the biggest increases seen successful pounds and pence was connected branded butter, with a 500g tub of Anchor Spreadable up by £1.31 implicit the two-year play and a 500g tub of Lurpak Spreadable Slightly Salted up by £1.17.
Twinings Everyday 100 Tea Bags saw the biggest idiosyncratic summation astatine 1 shop, up by £2.33, oregon 64%, this twelvemonth compared to its 2020 price.
Sue Davies, caput of nutrient argumentation astatine Which?, said: "Our probe shows the shocking complaint of ostentation connected immoderate of the nation's favourite branded foods, which is overmuch higher than the nationalist mean and highlights wherefore it is truthful important for retailers to supply radical with a prime of merchandise ranges."
While shoppers could prevention wealth by buying around, radical could beryllium paying implicit the likelihood if they unrecorded successful areas not good served by a prime of larger supermarkets oregon retailers that bash not banal cheaper own-brand and fund ranges.
"Supermarkets indispensable guarantee fund lines for steadfast and affordable indispensable items are wide disposable crossed their stores including smaller convenience stores," Ms Davies added.
In caller weeks, marketplace probe steadfast Kantar besides recovered that more shoppers were turning to supermarkets' cheaper own-label goods arsenic radical tried to prevention money.
It warned that prices whitethorn proceed to climb, with its caput of retail and user penetration Fraser McKevitt saying it was "too aboriginal to telephone the top" of wherever costs mightiness peak.
For months, nutrient manufacturers person been informing that they would request to summation prices due to the fact that of the outgo of earthy materials and vigor going up, partially owed to the ongoing struggle successful Ukraine.
In the summer, Tesco and Heinz had a dispute implicit the information the US elephantine tried to boost the prices it was charging the UK's biggest supermarket, with immoderate Heinz products adjacent disappearing from the chain's shelves briefly.
Heinz did not instantly respond to the BBC's petition for comment.