The gender pay gap fell to 9.6 per cent in April 2012 from 10.5 per cent in 2011, according to new figures published by the Office of National Statistics last week.
Tribunals have the power to strike out a claim if they consider it has no prospect of success.
Claimants can bring complaints of discrimination under the Disability Discrimination Act (now incorporated into the Equality Act) against fellow employees as well as their employer.