Mid Wales - ACU Centre/Region

that part of Meirionnydd district of Gwynedd situated south of a line from the junction of the Gwynedd/Powys/Clwydd boundaries through Maentwrog District boundary. The Montgomery and Radnor districts of Powys, those parts of the Brecknock district of Powys and the Ceredigion District of Dyfed situated north of a line from Aberystwyth to Builth Wells.