Allsupers Pricemonitor — edition 2026-05

Lowest-price overview and price index for UK supermarkets.

• Cheapest-basket gap — difference between cheapest and most expensive supermarket on a fixed intersection basket stocked by all retailers.
• A-brand price index (AAPI) — weekly index of 39 locked A-brand products, base December 2025 = 100. Tracks price movement over time.
• Shrinkflation monitor — register of EAN-level pack-size reductions with date, old/new size, and price-per-unit effect.

Products compared: 131,480