Did Hartley's Best jam (UK) shrink?
Before you paid £0.50 per 100 g; after, £0.57 per 100 g: 13.3% more for the same amount.
How big a cut? The joint 26th-largest of 37 documented baking & spreads cuts (tied with 1 other); a bigger cut than 45% of all 1,366 cases in the library. See the biggest cuts →
- When
- 2026 · reported 15 May 2026
- Country
- United Kingdom
- Brand
- Hartley's
- Category
- Baking & Spreads
- Source
- allsupers.co.uk
Source and evidence
Against official inflation: ONS CPI (UK) “food” changed +2.1% (12 months to May 2026, a broad match for this category). This pack’s price per gram changed +13.3%, 11.2 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: Hartley's Best Strawberry Jam (Morrisons), size 340 g, regular price £1.70, price per unit £5.00/kg. Now: Hartley's Best Strawberry Jam 300G (Morrisons), size 300 g, regular price £1.70, price per unit £5.67/kg. First detected: 17 May 2026. New pack since 15 May 2026.”
More from the UK: the UK Shrinkflation Tracker has all 175 documented cases, sortable and filterable.
Topic guide: jam, spreads and baking shrinkflation, every documented case in one place, brand by brand.
More baking & spreads in United Kingdom
All 2 in the case library →- Baking & Spreads · 2024
Ocean Spray cranberry sauce jar, smooth and whole
250 → 200 g−20.0%
United Kingdom · Source: which.co.uk
Newest in baking & spreads
Jam, spreads and baking shrinkflation →- Baking & Spreads · 2026
Welch's Grape Jam jar
32 → 30 oz−6.2%
United States · Source: mouseprint.org - Baking & Spreads · 2026
Hungry Jack Syrup
27.6 → 24 oz−13.0%
United States · Source: mouseprint.org - Baking & Spreads · 2026
Bonne Maman Haselnuss & Kakao Creme
360 → 250 g−30.6%
Germany · Source: vzhh.de
