The National Policy Planning Framework [NPPF] was published by the UK's Department of Communities and Local Government in March 2012, consolidating over two dozen previously issued documents called Planning Policy Statements (PPS) and Planning Policy Guidance Notes (PPG) for use in England.  It purported to simplify the large range of documents but has led to new cases in the courts leading to interpretation of its meaning.  Its intention was to loosen previous restrictions on building on Green Belt land.