The Teifi is probably 2hrs+ from Usk??
Try Llangorse Lake, about 6 miles east of Brecon. Head for the south side, near a village/church called Llangasty. Go past the church and you soon reach a small car park right by the edge of the lake. Walk 5 mins westwards along a public footpath and you will come to the most amazing bird hide you have ever seen. If you have wellies you can wade through the reeds to a small wooden jetty.
Magic place, especially at dawn.
But the north side of the lake is busy and commercialised. Avoid!
Thanks Jeremy, that sounds perfect.
Just looking at google now Jeremy, http://goo.gl/maps/jIhQC
is this the hide? http://jonnybriggsjoinery.wordpress.com/2012/02/21/llangorse-lake-bird-hide/ impressive!
lol yeh!