The triple lock is a safeguard that applies to the UK state pension to ensure it doesnt lose value because of inflation. It was introduced in 2010 by the Conservative-Liberal Democrat coalition government to guarantee that the state pension would not lose value in real terms and that it would rise at least in line with inflation. Under the triple lock system, the state pension increases each April in line with whichever of these three measures is highest: inflation, as measured by the Consumer Prices Index in the September of the previous year, the average increase in wages across the UK, or 2.5%. The triple lock guarantees pensioners a minimum annual increase of 2.5% on their state pension, so in a year when price inflation and wage growth are low (below 2.5%), pensioners will still see a respectable increase in their pension. The triple lock was temporarily suspended after the Covid pandemic distorted average wage figures, but it has since been restored.