You can challenge a decision made by the Welsh Language Commissioner relating to the Welsh Language Standards in the following circumstances:
Important: Usually, you must submit your application to the Tribunal within 28 days, starting on the day you were officially informed of the Commissioner's decision.
Welsh Language Tribunal
Once an application to the Tribunal has been made, a person other than the applicant and the Commissioner can apply to be joined as a party to the case. For more information on how to do so, go to the FAQs - Making an application page.