We investigate the effectiveness of government backed venture capital schemes (GVCs) in funding early stage entrepreneurial ventures. Addressing fundamental issues of additionality, crowding out, economic impact and sustainability, we discover that UK GVC-backed schemes have evolved to provide more effective, targeted, funding for high growth potential firms. Combining primary data from a number of sources, we discover positive impacts of increases in turnover and employment in funded ventures, along with effective targeting of specific funding gaps. Significant issues remain, including a lack of liquidity in follow-on funding and a requirement for longer time horizon in funds, as firms typically fall behind in development schedules. There is, therefore, a need for greater flexibility in GVC-backed funds. Policy designers should be cognisant of the changing external financing ecosystem when designing co-investment schemes.