Article 23U.K.Spatial and temporal validity
1.A licence shall be valid throughout the territory of the Union.
2.A licence shall be valid as long as the railway undertaking fulfils the obligations laid down in this Chapter. A licensing authority may, however, make provision for a regular review. If so, the review shall be carried out at least every five years.
3.Specific provisions governing the suspension or revocation of a licence may be incorporated in the licence itself.