Reference card
Inflation
Three official measures, side by side. They differ by construction - CPIH includes owner-occupiers' housing costs, CPI excludes them, RPI is no longer a National Statistic but is still used for some indexation.
ONS designates CPIH as its lead measure. RPI lost National Statistic status in 2013; it typically runs higher than CPI by construction.
Prices rose 3% in the year to May 2026
On the fullest official measure, something that cost £100 a year earlier typically cost £103 by May 2026. That is slower than a year before, when the rate was 4%.
Full provenance - official series name, source, fingerprint
Prices rose 2.8% in the year to May 2026
On the international-standard CPI measure, something that cost £100 a year earlier typically cost £102.80 by May 2026. That is slower than a year before, when the rate was 3.4%.
Full provenance - official series name, source, fingerprint
Prices rose 3.1% in the year to May 2026
On the older RPI measure, something that cost £100 a year earlier typically cost £103.10 by May 2026. That is slower than a year before, when the rate was 4.3%.
Full provenance - official series name, source, fingerprint
Revision history - every earlier capture, kept
Official series get revised; records here are never overwritten. A changed figure is integrity, not error, when the change is visible.