ShrinkRadar
PlusSign inMy alerts
Menu

Did M&M's Peanut family pouch (UK) shrink?

Size FactsDid it shrink? Yes
Before400 g
After330 g
−17.5%smaller
Price per 100 g · observed+9.1%Shelf price £5.00 → £4.50, as recorded by the source.

Before you paid £1.25 per 100 g; after, £1.36 per 100 g: 9.1% more for the same amount.

How big a cut? The joint 49th-largest of 189 documented chocolate & candy cuts (tied with 5 others); a bigger cut than 69% of all 1,366 cases in the library. See the biggest cuts →

When
2026 · reported 13 Aug 2026
Country
United Kingdom
Brand
M&M's
Category
Chocolate & Candy
Source
allsupers.co.uk

Source and evidence

M&M's Peanut Milk Chocolate Family 330g: 400 g → 330 g — Shrinkflation | Allsupers | Allsupers allsupers.co.uk

Source fetched 2026-10-22. All 59 Allsupers cases.

Found by Allsupers' automated check of Tesco listings (record 16545): the old listing disappeared and a smaller pack of the same product appeared (first detected 2026-08-13); regular price £5.00 before, £4.50 after.

Evidence
Typeautomated supermarket price tracker (Allsupers register; retailer listings, regular prices recorded)
Confidencemedium
Size cut alone, at the old price+21.2%

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 +0.5% (12 months to Aug 2026). This pack’s price per gram changed +9.1%, 8.6 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

“Before: M&M's Peanut Milk Chocolate Family Pouch 400g (Tesco), size 400 g, regular price £5.00, price per unit £12.50/kg. Now: M&M's Peanut Milk Chocolate Family 330g (Tesco), size 330 g, regular price £4.50, price per unit £13.64/kg. First detected: 13 August 2026. New pack since 13 August 2026.”

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 from M&M's

All 13 M&M's cases →

More chocolate & candy in United Kingdom

All 55 in the case library →

Newest in chocolate & candy

Chocolate shrinkflation →

Share, embed or cite this case

XRedditFacebookBlueskyEmail

Shared links show this size card image (PNG, 1200×630), which you can also download and post.

Embed this case on your site

Paste this HTML into a post or page. The card shows the size change and links to this page and the original source. It is free to use; please keep the links.

Preview the embed card

Cite this case

ShrinkRadar, “Did M&M's Peanut family pouch (UK) shrink? 400 g → 330 g”, https://shrinkradar.com/cases/mandm-s-peanut-family-pouch-uk-uk-2026.html, accessed 2026-11-05. Original source: M&M's Peanut Milk Chocolate Family 330g: 400 g → 330 g — Shrinkflation | Allsupers | Allsupers (https://allsupers.co.uk/research/shrinkflation/ean_swap/16545).

You may quote and cite this case with credit. No bulk reuse or republishing of the dataset without permission: licence and how to cite.