In this special edition of 'Cefn Gwlad', Dai Jones, Llanilar visits the picturesque area of Heol Senni, Sennybridge, near Brecon between June and October 2011. Dai hears the story of how the local residents fought against the threat of drowning the valley, some years ago. He also meets one of the area's oldest characters and follows the seasonal work on some of the farms.