@Gargron I've often wondered when I see scenic vistas like this, are the shrubs just naturally that short? Around here in Kentucky if you don't mow and weed eat the areas of the hillside you care about before long it'll be a jungle with bushes taller than you are.
@gerowen At least where I am in the UK, such landscapes are usually down to grazing - here, it is sheep. Lots of British uplands would be forest naturally but instead look much like this scene.