"People whom in the past wouldn't come through the door are now regular customers."
There have been many hundreds of volunteers work in the Whangarei store, said Ms Heatley. She has served as a trustee, still works in the shop and helps with volunteer training and education. She also spent a three-year term on the TANZ governance board which sets national policy and direction.
The Whangarei team is considering how to celebrate the organisation's 40th milestone, manager Rebecca McInnes said.
"This is a chance to acknowledge the huge impact of New Zealand people who have, as shoppers, volunteers and staff, played a vital role in supporting the goals of people struggling to work their way out of poverty.
"Often we underestimate the power of our purchasing dollar but when you hear stories of a new school in Ethiopia, a health clinic in Bangladesh, a literacy class in India and an eco-tourism project in Peru, you do see the impact of those purchases."
The anniversary coincides with the publication of Groundchange: the Story of Trade Aid by Sally Blundell which traces the development of Trade Aid from a handful of small retail outlets into a nationwide movement.