A quiet correction is underway in the United Kingdom, where roughly one million low-earning workers — most of them women — are owed small but meaningful sums from a pension system that treated them unequally for years. HMRC will begin sending letters explaining that a structural disparity between two pension tax relief arrangements left certain earners short-changed, and that the government now intends to make them whole. The payments, averaging around £70, require no application — only trust, which may prove the harder thing to ask of people long accustomed to being overlooked.