The Labour Force Survey unemployment rate, ages 16 and over, as a rolling three-month average. The threshold is the Sahm construction: half a point above the past year's low.
Threshold source: worldstat.us construction after the Sahm rule, on the ONS three-month rate. How thresholds are chosen
The Labour Force Survey has had response-rate problems since 2023 and the ONS labels the series as official statistics in development.