The Commission has determined that a county constituency be created from:The Ceredigion Preseli UK Parliamentary constituency,and:The Mid and South Pembrokeshire UK Parliamentary constituency.
Mae’r Comisiwn wedi penderfynu creu etholaeth sirol o’r canlynol:Etholaeth Seneddol y Deyrnas Unedig Ceredigion Preseli,ac:Etholaeth Seneddol y Deyrnas Unedig Canol a De Sir Benfro.