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Matt Baker and Julia Bradbury explore the Brecon Beacons – one of the finest landscapes in Wales with stunning mountains, open grassland and beautiful lakes. Matt heads to Llangorse, Brecon's only natural lake, where Dark Ages rulers built an island refuge to keep them safe from invaders. While Matt explores the past, Julia goes fly fishing on the River Usk where improvements in the habitat mean fish numbers are on the up. Later, she goes on the hunt for a fabulously rare bird: a pure white version of the red kite. High up on the Welsh mountains, James Wong learns how the humble daffodil could play an important part in treating Alzheimer's.

Elsewhere, Tom Heap asks whether hospital food is all it's cracked up to be and Adam Henson recreates history when he goes back to basics to produce the original Suffolk sheep.