Regulations made by the government which grants what is effectively a nationwide planning permission for specified minor developments. The full title of the current GPDO is the Town and Country Planning (General Permitted Development) (England) Order 2015 (SI 2015/596). At the time of writing one amendment has been made to this Order, but it is possible further amendments may be made to it in future.

A designation for land around certain cities and large built-up areas, which aims to keep this land permanently open or largely undeveloped.

Land (or a defined site) usually farmland, that has not previously been developed. This should not be confused with Green Belt which is a specific designation.