Yes. The minimum wage was originally brought in (at £3.60 an hour for adults, and £3.00 an hour for 18-21 year olds) in April 1999. Subject to the exceptions outlined above for family or voluntary workers (see questions 4 and 5), anyone who has worked for you since at less than the minimum wage can require you to pay the difference. There is however an overall limit of six years on the amount of arrears that can be claimed. There is, however, an overall limit of six years on the amount of arrears that can be claimed.