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Did Starburst sweets bag (UK) shrink?

Size FactsDid it shrink? Yes
Before152 g
After138 g
−9.2%smaller
Price per 100 g · observed+37.7%Shelf price £1 → £1.25, as recorded by the source.

Before you paid £0.66 per 100 g; after, £0.91 per 100 g: 37.7% more for the same amount.

How big a cut? The joint 139th-largest of 189 documented chocolate & candy cuts (tied with 1 other); a bigger cut than 28% of all 1,366 cases in the library. See the biggest cuts →

When
2023 · reported 17 Aug 2023
Country
United Kingdom
Brand
Starburst
Category
Chocolate & Candy
Source
thegrocer.co.uk

Source and evidence

The Grocer — Mars Wrigley shrinks Starburst packs, citing rising costs (17 Aug 2023) thegrocer.co.uk

Source fetched 2026-11-02. All 33 The Grocer cases.

152 g became 138 g, about three fewer sweets. Tesco, Asda and Morrisons kept £1.25; Sainsbury's went from £1 to £1.25 (+37.7% per 100 g).

Evidence
Typetrade press investigation (The Grocer, Assosia shelf-price data)
Confidencehigh
Size cut alone, at the old price+10.1%

Check the math in the calculator or compare old and new unit prices.

Against official inflation: ONS CPI (UK) “sugar, jam, honey, syrups, chocolate and confectionery” changed +15.2% (12 months to Aug 2023). This pack’s price per gram changed +37.7%, 22.5 percentage points above the official rate, using the shelf prices the source recorded. Every case is compared the same way in the ShrinkRadar Index.

What the source says

“…become the latest high-profile casualty of shrinkflation, with its pouches now containing three fewer sweets than they did previously, The Grocer can reveal. Owner Mars Wrigley has replaced the former 152g packs with 138g ones, but shelf prices have remained the same or risen in the multiples.”

More from the UK: the UK Shrinkflation Tracker has all 175 documented cases, sortable and filterable.

Topic guide: chocolate shrinkflation, every documented case in one place, brand by brand.

More chocolate & candy in United Kingdom

All 55 in the case library →

Newest in chocolate & candy

Chocolate shrinkflation →

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Cite this case

ShrinkRadar, “Did Starburst sweets bag (UK) shrink? 152 g → 138 g”, https://shrinkradar.com/cases/starburst-sweets-bag-uk-2023.html, accessed 2026-11-05. Original source: The Grocer — Mars Wrigley shrinks Starburst packs, citing rising costs (17 Aug 2023) (https://www.thegrocer.co.uk/news/mars-wrigley-shrinks-starburst-packs-citing-rising-costs/682324.article).

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