Builth Wells is a market town and community in the county Powys and historic county Brecknockshire, mid-Wales, lying at the confluence of rivers Wye and Irfon in the Welsh part of the Wye Valley. In 2011 it had a population of 2,568. From Wikipedia
The mouse, discovered by the retired postman in Powys, Wales, has been moving items into a box every night for about two months, leading to speculation about its behavior.