Jonathon Porritt does not like to describe himself as a ‘greenie’ – not least because his work over the past 40 years has been as much about tackling economic, social and strategic issues as anything else – but he continues to bang the drum for progressive thinking, in politics, business and beyond.

And, as you’re about to find out during our extensive and wide-ranging interview this week, he continues to despair at the lack of government intervention in supporting companies of all shapes and sizes to get on the right path towards sustainability – describing as "utterly pathetic", the UK government’s insistence that letting companies make voluntary commitments is enough to transform the economy.