Answer: There is no qualifying period!
A right to bring a claim for discrimination applies from day one of your employment. The right also applies to workers who are contracted to do work for the employer, including agency workers and, in some cases, the self-employed. Applications for posts are also protected from being discriminated against by an employer in the arrangements made to determine who should be offered a job. however, it should be noted that an applicant for a job who has no interest in accepting a post , even if it was offered, has no claim for discrimination if they are unsuccessful.