By Simon Brammer, Ashden UK Programme Manager

Driving through the Snowdonia National Park last week with National Trust energy champions Keith Jones and Paul Southall was an experience – not just because of the spectacular views of the mountains on a rare sunny day – but also because their knowledge of the transformational potential of renewable energy is frankly astounding.

With Paul a self-confessed LED light bulb freak (we get on well) and Keith totally obsessed with hydro power, they make quite a team.