The Regulations give part-time workers the right in principle not to be treated less favourably than full-time workers of the same employer who work under the same type of employment contract. The Regulations also give a right to workers who become part-time or, having been full-time, return part-time after absence, to be treated not less favourably than they were before going part-time. The rights apply where the less favourable treatment is on the ground that the worker is part-time and is not justified on objective grounds, and the rights are exercisable by complaint to an employment tribunal.