UK gender pay gap underestimated for two decades, report says

Findings suggest since 2004 ONS failed to properly account for fact it received more data from larger employers

The UK's gender pay gap has been underestimated for more than 20 years, according to research that could raise fresh questions about the quality of data used to inform key pay decisions across the UK.

The findings, released in the British Journal of Industrial Relations on Monday, suggest that, since 2004, the Office for National Statistics (ONS) had failed to properly account for the fact that it received more data from larger employers, when it reported its annual survey of hours and earnings (Ashe).