Demarcated area 12 comes into force on 24 January 2023 replacing Demarcated Area 7 which was issued on 21 April 2022.
Daw Ardal a Ddarnodir 12 i rym ar 24 Ionawr 2023 gan ddisodli Ardal a Ddarnodir 7 (map Ardal a Ddarnodir) a gyhoeddwyd ar 21 Ebrill 2022.