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Did Buster bathroom plug unblocker (UK) shrink?

Size FactsDid it shrink? Yes
Before600 ml
After300 ml
−50.0%smaller
Price per 100 ml · observed+33.3%Shelf price £6.00 → £4.00, as recorded by the source.

Before you paid £1.00 per 100 ml; after, £1.33 per 100 ml: 33.3% more for the same amount.

How big a cut? The largest of 52 documented dish & cleaning cuts; a bigger cut than 98% of all 1,366 cases in the library. See the biggest cuts →

When
2026 · reported 7 Jul 2026
Country
United Kingdom
Brand
Buster
Category
Dish & Cleaning
Source
allsupers.co.uk

Source and evidence

Buster Bathroom Plug Unblocker 300Ml: 600 ml → 300 ml — Shrinkflation | Allsupers | Allsupers allsupers.co.uk

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

Found by Allsupers' automated check of Tesco listings (record 10731): the old listing disappeared and a smaller pack of the same product appeared (first detected 2026-07-07); regular price £6.00 before, £4.00 after. The old bottle was sold as two doses; the new one is half the size at two-thirds of the price, 33% more per ml.

Evidence
Typeautomated supermarket price tracker (Allsupers register; retailer listings, regular prices recorded)
Confidencemedium
Size cut alone, at the old price+100.0%

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

Against official inflation: ONS CPI (UK) “cleaning and maintenance products” changed +4.3% (12 months to Jul 2026). This pack’s price per millilitre changed +33.3%, 29.0 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: Buster 2 Dose Bathroom Unblocker 600ml (Tesco), size 600 ml, regular price £6.00, price per unit £10.00/l. Now: Buster Bathroom Plug Unblocker 300Ml (Tesco), size 300 ml, regular price £4.00, price per unit £13.33/l. First detected: 7 July 2026. New pack since 19 May 2026.”

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

Topic guide: cleaning products and dish soap shrinkflation, every documented case in one place, brand by brand.

More dish & cleaning in United Kingdom

All 6 in the case library →

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Cite this case

ShrinkRadar, “Did Buster bathroom plug unblocker (UK) shrink? 600 ml → 300 ml”, https://shrinkradar.com/cases/buster-bathroom-plug-unblocker-uk-uk-2026.html, accessed 2026-11-05. Original source: Buster Bathroom Plug Unblocker 300Ml: 600 ml → 300 ml — Shrinkflation | Allsupers | Allsupers (https://allsupers.co.uk/research/shrinkflation/ean_swap/10731).

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