Midlothian, Scotland, is a metropolitan area with a population of over 80,000 people. Midlothian Council, the local state, is the biggest employer in the region, employing over 4,000 people. Unison Midlothian, as the largest trade union in the council with over 2,000 members, is currently linking the development of social capital to lifelong learning through various initiatives. This paper explores trade unions historic and significant role in building learning and social capital particularly in disadvantaged communities.