Less favourable treatment of part-time workers
5.—(1) A part-time worker has the right not to be treated by his employer less favourably than the employer treats a comparable full-time worker—
(a)as regards the terms of his contract; or
(b)by being subjected to any other detriment by any act, or deliberate failure to act, of his employer.
(2) The right conferred by paragraph (1) applies only if—
(a)the treatment is on the ground that the worker is a part-time worker, and
(b)the treatment is not justified on objective grounds.
(3) In determining whether a part-time worker has been treated less favourably than a comparable full-time worker the pro rata principle shall be applied unless it is inappropriate.
(4) A part-time worker paid at a lower rate for overtime worked by him in a period than a comparable full-time worker is or would be paid for overtime worked by him in the same period shall not, for that reason, be regarded as treated less favourably than the comparable full-time worker where, or to the extent that, the total number of hours worked by the part-time worker in the period, including overtime, does not exceed the number of hours the comparable full-time worker is required to work in the period, disregarding absences from work and overtime.