Press
For journalists and writers: the UK Online Shelf-Price Index, how to cite it, and who to contact.
The UK Online Shelf-Price Index in brief
The UK Online Shelf-Price Index follows about 71,000 online prices a week at Tesco, Sainsbury's, Asda and Aldi, matching the same products from one week to the next. It is point-in-time data, published once a week and never revised, and it measures posted shelf prices, not prices paid, so it is not CPI. The series started with a base of 100 at ISO week 2026-W39; week 2026-W41 was skipped after an incomplete collection, so the index restarts with a new base at week 42 (see the notice).
Cite as
Using the figures
The index values are licensed CC BY 4.0. You may copy, share and adapt them, including commercially, as long as you credit Yappman Data, link to the licence and say if you changed anything. The product-level data behind the index is licensed separately.
Retailer names are used only to describe the source of public product information; no affiliation, endorsement or partnership is claimed.
Latest finding
Two pack-size reductions were confirmed between week 39 and week 40. Asda's Kenco Millicano went from 100 g to 90 g, with its price moving from £3.50 to £4.00. Sainsbury's stuffed mushrooms went from 200 g to 190 g at £2.10.
Read more: the newsletter issue and the dev.to write-up of the pack-size scan.
Links
- UK Online Shelf-Price Index: latest week, series and downloads.
- UK Supermarket Prices: Daily 212-Item Basket on Kaggle: a free sample (CC BY 4.0).
- UK Supermarket Price Scraper, the live Actor on the Apify Store.
- The newsletter: a weekly look at the index.
Contact
Email data@yappman.com. We will run a comparison on request at no charge.