CROSS-CATEGORY ANALYSIS

Where shopping around pays.

Median price spread between the cheapest and dearest UK retailer, on identical barcodes only. Measured across 1,492,649 products.

By department

Spread is the gap between the lowest and highest current price for the same barcode, as a share of the highest. The median is used rather than the mean so a handful of extreme listings cannot move the figure. Products where retailers disagree by more than fourfold are excluded from the index entirely, because such a gap almost always means the offers are not the same commercial product.

Retailers analysed

235 UK retailers have enough contested products to measure. See who is cheapest most often →

Average price by department

Median and mean of each department’s cheapest available price, sampled from its 1,000 top-ranked products — the ones actually getting traffic — not an exhaustive average across every product, since some departments run to hundreds of thousands of items.

No price trend (rising/falling) yet. Daily price-history snapshots started 17 Aug 2026, but the automated rebuild that writes them currently runs weekly, so only one snapshot exists — not enough to say which way prices are moving. A trend needs at least two separate snapshots to mean anything; fabricating a direction from a single point-in-time capture would just be a guess dressed up as data. This refreshes automatically once a second snapshot lands.