As a partial answer, this goes to the very first question that your honourable colleague asked about limits and framing the use of this instrument called social finance. Not everything that is worthy of being done is susceptible to measurement, so you have to have a situation in which the good work that is sought to be accomplished is susceptible to measurement and there are people who are willing to put invested capital into it in return for, as Tim keeps saying, either just their money back and the feeling they have done a good thing, or perhaps a small return that would be below market.
You would have a very limited number of places where the outcomes are measurable. When I say limited, I mean compared to the universe of all works that are done for the public good and the relief of poverty and other charitable purposes, but not very limited when you start to enumerate them. Finding work for otherwise unemployable people, preventing recidivism, housing people who would otherwise be unhoused—these things are easily measurable from publicly available statistics.