Post Office – Lampeter, Llanwnen – Opening Hours & Branch Details You will find Post Office ideally situated on Pentrebach, a 1.76 mile driving distance west of the centre of Lampeter (not far from Church of Our Lady of Mount Carmel and Uwtsd Sports Ground). This branch is an added feature to the districts of Llanwnen, Aber, Barley Mow, Llanwnnen, Maestir and Pencarreg. If you plan to swing by today (Friday), its hours of opening are 7:00 am to 10:00 pm. Read the specifics on this page for Post Office Lampeter, Llanwnen, including the open hours, local directions, telephone info and more.