You might find some of these reports useful. Some reports are held as PDF documents within the site and others link to other sites.

Global Impact Investing Network (GIIN)
Global Impact Investing Network (GIIN) network are releasing their report on The State of Impact Measurement and Management Practice . The report provides a comprehensive survey of the state of...
Charities Aid Foundation
New CAF report shows philanthropy booming in the UK with contributions by major donors through funds like DAFs projected to grow to £700m by 2020. Charities Aid Foundation (CAF) and...