Thoughts on evaluating Green Exercise and Our Natural Health Service Dominic Hall, Operations Leader - Communities and Biodiversity, The Conservation Volunteers I pride myself on being logically minded – and I am drawn instinctive to the idea of evidence led policy. The basic idea that decisions should be made based on solid, researched evidence as opposed to gut instinct, political expedience or personal agendas seems entirely compelling. However, the more you look at what this means in practice the more complex and challenging it becomes. Policy issues are complex, multi-dimensional and multi-facetted. Robust, research evidence is difficult to produce and tends from necessity [...]