Refuse workers at Glasgow City Council have been told to repay £40,000 after a payroll error led to them receiving a higher wage for several years. An internal audit revealed that the five staff members had been inadvertently paid extra amounts for contractual overtime on a monthly basis. The error is understood to go back up to four years in some cases, with one individual earning about £15,000 extra. Chris Mitchell, the GMB convenor for Glasgow’s cleansing and refuse workers, said the people involved have essentially “taken a pay cut” due to the repayment plan, which requires them to pay £40 to £70 a month. “They have basically taken a pay cut.”Glasgow City Council have been contacted for comment.