By Venturesome/CAF, September 2009. Charities Aid Foundation (CAF) is a registered charity that works to make the most of money for charities and social enterprises. CAF believes that access to capital is vital for a healthy and thriving charitable sector. Venturesome provides capital to charities and social enterprises, operating in the space between providers of charitable grants and providers of bank loans at market rates. Since its launch by CAF in 2002, ?15 million has been offered to 250 organisations. This paper is a contribution to the current thinking on social investment, and the role that a Social Investment Wholesale Bank might play in supporting the existing ecology of this emerging and still fragile market.