Post Office – Lampeter, Llangybi mobile service – Opening Hours & Branch Details You can find Post Office on Outside Llangybi Stores, a 3.67 mile drive north-east from the centre of Lampeter. This branch is available for the people of Gartheli, Llanfair Clydogau, Llangybr Common, Olmarch, Bettws Bledrws and Llangybi. Today (Friday), hours of business begin at 10:00 am and end at 11:00 am. Hours of operation, directions and phone number for Post Office Lampeter, Llangybi mobile service can be found on this page.