Interim report on geophysical surveys and excavation undertaken in 2005–6 on a cropmarked enclosure at Ffynnonwen, Tremain. The survey detected an oval enclosure 160m x 140m within which, and offset from the centre, lay a circular enclosure 45m in diameter. Four round houses and other features were apparent in the inner enclosure. Excavation concentrated on the inner enclosure, revealing one complete round house and parts of two others. A four-post structure and a six-post structure were also investigated. The defensive ditch on the southwest side of the circular enclosure was rock-cut 4.2m wide and 2.2m deep, but on the north side the ditch was unfinished. The ditch of the oval enclosure was 3.8m wide and c. 1m deep. The structural remains are characteristic of a late prehistoric settlement; however, dating evidence was scarce, with artefacts combined to several pieces of slag, part of a glass bead, a spindle whorl made from a re-used piece of Roman Severn Valley Ware pottery and a Mesolithic flint microlith.