Sidmouth has an ageing population with many grandparents:
Futures Forum: East Devon's population
Futures Forum: Sidmouth's ageing population: "Without urgent investment in coastal communities, some areas will struggle to retain the working age families needed to fuel the economies of towns dominated by old people’s homes."
Here is a newly-launched group which might be of interest:
Grandparents taking action on climate change
Grandparents taking action on climate change | Campaign against Climate Change