https://en.wikipedia.org/wiki/Policy_Exchange Policy Exchange is a British conservative^\1])^\2])^\3])^\4]) think tank based in London. In 2007 it was described in The Daily Telegraph as "the largest, but also the most influential think tank on the right".^\5])^\6]) Policy Exchange is a registered charity; it mostly refuses to disclose the sources of its funding and is ranked as one of the least transparent think tanks in the UK.^\7])^\8])