Do the Welsh Language Standards apply to third parties?

If a third party provides a service on behalf of the University then the Standards apply to them as well. See the guide on third parties - Contracts and Tenders.  There is a checklist available for third parties which gives examples of possible activities where the Standards would apply - Welsh Language Standards Checklist for Third Party Providers.  The Welsh Language Commissioner has also developed a guide - Bidding for Contracts and Grants: Welsh Language Considerations.