As a part-time worker you have the right to be treated no less favourably than a comparable full-time worker unless there is a reason for the difference in treatment that can be objectively justified.
If you believe your employer is treating you less favourably on the grounds of you being a part-time worker you should bring a formal grievance against your employer. Bear in mind though that the time limit for presenting a tribunal claim is no more than 3 months from the date of the act or omission you want to complain about.
If you have raised the issue on several occasions but the less favourable treatment has persisted uninterrupted (ie. continuously over a certain period), the time limits will begin from the date of your last complaint.
