British Gas's parent company Centrica, Euro Garages and Holland & Barrett are among the latest companies named and shamed by the government for underpaying staff.
The Department for Business and Trade (DBT) has released a list of nearly 500 employers fined more than £10m for failing to pay the national minimum wage. It said 42,000 workers were repaid more than £6m.
Business Secretary Peter Kyle said: "I know that no employer wants to end up on one of these lists. But our Plan to Make Work Pay cracks down on those not playing by the rules."
All three firms blamed past payroll problems for the underpayments and said all affected staff had been remunerated.
All the employers named on DBT's list were fined up to double the total amount they owed to staff, some for underpayments dating as far back as 2013.
