Part-time Workers (Prevention of Less Favourable Treatment) Regulations 2000

The Part-time Workers (Prevention of Less Favourable Treatment) Regulations 2000 (SI 2000/1551)is a UK labour law measure which requires that employers give people on part-time contracts comparable treatment to people on full-time contracts who do the same jobs. It implements the Part-time Work Directive 97/81/EC, and forms part of the European Union's programme to combat discrimination of atypical workers. Because the large majority of part-time workers are female, it is also an important attempt to combat sex discrimination.

...
Wikipedia