1. Usk

Iolo Williams explores the Usk valley, from Newport’s urban wildlife to ground-nesting birds, a huge lesser horseshoe bat roost and scarce firecrests.

3. Teifi

Iolo explores the Teifi river valley, and finds a slow worm hunting, meets a coracle fisherman, is thrilled by a fishing Otter, and watches a pair of kestrels at their nest.

4. Dee

Iolo explores the stunning Dee valley, from wintering birds along the estuary, to displaying black grouse on moorland, rare freshwater-pearl mussels, and spawning sea trout.