Imperfect information on the costs and benefits of different pollution abatement choices is further complicated by multifaceted production relationships, such as the response of farmers to weather, climate change, and market uncertainty (Doole and Pannell, 2009, National Audit Office, 2010). But because information is imperfect, decision making under uncertainty will be unavoidable. In the light of information and data deficiencies policy makers need to rely much more heavily on modelled information approaches, both economic models and bio-physical models, to inform policy design, choice, monitoring and evaluation (Cabe and Herriges, 1992, Doole and Pannell, 2009, Schreiber et al.,