Companies which employ more than 250 people are reminded that they will soon have to reveal differences between average pay for male and female workers under a change to a law passing through Parliament.
Large firms that do not comply with the new rules could face fines of up to £5,000. At present, five firms have published gender pay figures under the current, voluntary approach.
The issue will be debated in the House of Lords, with the government tabling an amendment to the Small Business Bill. The bill is likely to come into force within the next 12 months.