Murmurs of the Kerry Ridgeway (part 2) - what rush hour sounds like in the hills of mid-Wales

Over the hills above the sun is going down. It's been a warm dry April day along the Kerry Ridgeway. High pressure, light breezes. It's late afternoon and cars, tractors, farm vehicles and the odd lorry rattle past. Hidden behind hedgerows down a steep bank a timeless stream flows under trees. It is alive with birds. The ground is ankle deep with dry leaves. Occasionally a roving bee comes along, to look at the microphones. This is a secluded spot in a wide open landscape of steep fields and woodland.