This study identifies firms that have received support for innovation through twenty-five government programmes since 2004. It examines the effect of these programmes on these firms’ performance, looking at their long-term sales turnover growth, employment growth, innovation and survival. The most advanced counterfactual impact evaluation methods are deployed using government administrative datasets. Outcomes are compared against matching control groups so as to isolate the programmes’ impact. Middlesex University’s contribution to the study is an examination of knowledge-spillover effects and is led by Dr James Derbyshire.