For non BBC Wales viewers it can be found on IPlayer. Williams goes round various parts of Wales (obv Anglesey In this series) followed by a film crew observing the local flora and fauna. Pretty banal stuff really, non of the jaw dropping sequences you find in an Attenborough programme. What makes it watchable is the presenters enthusiasm, to see a man so delighted in the simple pleasure of watching a hare or finding a bittern. Your mood is certainly better at the end of the half hour than when you started watching.
If you watch it you'll find it is a cracking little programme.