Glossary
N
Neighbourhood plans
A plan prepared by a Parish Council or Neighbourhood Forum for a particular neighbourhood area (made under the Planning and Compulsory Purchase Act 2004).
Non-hydraulic, air or calcium lime
Lime prepared from a relatively pure limestone containing no significant amounts of reactive silica and alumina. It is classified as CL under European standards. The purest type is described as 'fat', the less pure as 'lean'. The impurities in the latter impart a slight hydraulicity but not enough for the lime to be called 'hydraulic'. These limes will harden initially by drying out and in the longer term by absorbing carbon dioxide form the air to form calcium carbonate ('carbonation'). They cannot harden under water (cf hydraulic lime).