Diana worked in Brussels for many years as Director of the EU-CORD network of European Christian relief and development agencies, helping them to access EU funding and to advocate for poor and vulnerable people across the developing world. The Leprosy Mission was a member of EU-CORD and Diana visited their projects in Bangladesh and Ethiopia in the course of her work.

She felt inspired to continue to support The Leprosy Mission when she returned to live in the UK and joined the Board in 2016. She is also a trustee of another Christian NGO which is active in the field of international development.