The document discusses sustainable funding for charitable organizations in London. It provides an overview of different funding approaches used by the City Bridge Trust, including traditional grant-making of £17 million as well as strategic initiatives and added value funding. It also discusses new forms of social investment funding that are emerging, such as social impact bonds that provide returns based on improved social outcomes. As an example, it outlines the Allia East London Bond that provided £100,000 in funding to social housing and community organizations through a fixed-term bond.