Plot: There's an island-ish round area of stones in Loch Migdale - could it be a crannog? 200 meters away on the banks is a small (12 m diameter) circular feature - is it a henge? Time Team rounds up some experts on the prehistoric and finds out. They set up a suction dredge to investigate two areas of the loch feature, and find wonderfully preserved timber, proving that it's a built structure and thus a crannog