"6. Delivering a wide choice of high quality homes 47. To boost significantly the supply of housing, local planning authorities should: • use their evidence base to ensure that their Local Plan meets the full, objectively assessed needs for market and affordable housing in the housing market area, as far as is consistent with the policies set out in this Framework, including identifying key sites which are critical to the delivery of the housing strategy over the plan period; • identify and update annually a supply of specific deliverable sites sufficient to provide five years' worth of housing against their housing requirements with an additional buffer of 5% (moved forward from later in the plan period) to ensure choice and competition in the market for land. Where there has been a record of persistent under delivery of housing, local planning authorities should increase the buffer to 20% (moved forward from later in the plan period) to provide a realistic prospect of achieving the planned supply and to ensure choice and competition in the market for land (a footnote adds "
“Part of the Claimants challenge suggests that the NPPF has been misinterpreted. In Tesco Stores Limited v Dundee City Council[2012] PTSR 983 the Supreme Court held that the construction, or interpretation, of a planning policy is a question of law for the Court to determine objectively in accordance with the language used (paragraph 18). However, the Court went on to state that development plans and other policy documents are not analogous in their nature or purpose to a statute or contract and should not be construed as if they were. Moreover, many policies are framed in language the application of which to a given set of facts requires the exercise of judgment. Matters of that kind fall within the jurisdiction of planning authorities as decision-makers and their exercise of judgment can only be challenged in the Courts if it is irrational or perverse (paragraph 19). Therefore, in a case where the decision-maker has had regard to a policy which he was required to take into account, it is essential for practitioners to keep in mind the distinction between interpretation and application of policy and the very different functions of the court in each area.”
“Finally I should notice a subsidiary argument of Mr. Vandermeer. He submitted that a material consideration must be given some weight, even if it was very little. It was therefore wrong for the Secretary of State, if he did accept that the offer was a material consideration, to say that he would give it no weight at all. I think that a distinction between very little weight and no weight at all is a piece of scholasticism which would do the law no credit. If the planning authority ignores a material consideration because it has forgotten about it, or because it wrongly thinks that the law or departmental policy (as in Safeway Properties Ltd v Secretary of State for the Environment [1991] JPL 966) precludes it from taking it into account, then it has failed to have regard to a material consideration. But if the decision to give that consideration no weight is based on rational planning grounds, then the planning authority is entitled to ignore it”