In order to boost learning, recent UK governments have invested in trade union-led workplace learning. Investing in the supply of learning is useful but ignores the demand for learning by workers, about which there is little research. This paper addresses this lacunae by analysing worker demand for learning, which workers want learning, what learning is demanded and why, and what factors might best lever learning. Data come from two surveys of potential learners and union learning representatives. Findings reveal a large demand for learning and that unions can lever this learning. Findings also suggest further policy development to address problems associated with union-led learning. (Contains 4 notes and 5 tables.)