Guardian: When a group of residents declared Garstang in Lancashire a Fairtrade town 10 years ago, few imagined it was the start of a grassroots social movement that would sweep throughout the UK and beyond. “Our aim was simply to get people to help make trade fairer for farmers from developing countries,” says Garstang campaigner Bruce Crowther. “We never dreamed that we would inspire people around the world to campaign within their communities to make people’s shopping habits more …