Post Office – Llandysul, Plwmp – Opening Hours & Branch Details You’ll find Post Office on Plwmp Shop, about a 7.92 mile driving distance north-west of the centre of Llandysul. The branch is fittingly located for patrons from Sarnau, Llangranog, Capel Cynon, Pentregat, Llanarth, Plwmp, Penbryn and Brynhoffnant. Today (Friday), its opening times are 9:00 am to 5:30 pm. Operating hours, branch address or telephone info for Post Office Llandysul, Plwmp can be found here.