Establishing shots of the black mountains: a bleak alien landscape. Sheep are sparsely scattered across the area - there is a mini-rockfall and a sudden gush of water. The land's lead-mining past has left the area inhospitable.

Farmers mount their horses and begin to cross the mountains, first herding their flock together and then herding them down into the valley where they feed. The difficulty and inefficiency of their work is staggering.

The science research centre, where hardier, more persistent grasses are being grown. The scientists are growing many different varieties of grasses; they clean bees to ensure the correct plants are cross-pollinated. Eventually, the new crops are planted in nurseries.

Tractors plough up sections of a mountain; once cleared, these areas are cultivated with the scientifically developed seeds. More sheep, this time closer together and moving faster, cross streams and appear to move more freely. Their lives seem to have become easier, more productive.

A lone sheep contentedly chews cud. A series of titles explains the nature of the problems facing the sheep farmers of Wales.