Authorisation concerning data subject’s race or ethnic origin

29. The prohibition on processing personal information concerning a data subject’s
race or ethnic origin, as referred to in section 26, does not apply if the processing is
carried out to—
(a) identify data subjects and only when this is essential for that purpose; and
(b) comply with laws and other measures designed to protect or advance persons,
or categories of persons, disadvantaged by unfair discrimination.